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Maskal S, Chang J, Ellis R, Messer N, Melland-Smith M, Tu C, Miller B, Petro C, Simon R, Prabhu A, Rosen M, Beffa L. Abdominal wall mass resections: single-center closure practices and outcomes following oncologic resections of abdominal wall fascia. Hernia 2024; 28:457-464. [PMID: 38062203 DOI: 10.1007/s10029-023-02928-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 11/05/2023] [Indexed: 04/06/2024]
Abstract
PURPOSE Radical resections for abdominal wall tumors are rare, thus yielding limited data on reconstruction of defects. We describe surgical management and long-term outcomes following radical tumor resection. METHODS This was a single-center retrospective review of patients between January 2010 and December 2022. Variables included operative characteristics, wound complications, hernia development, tumor recurrence, and reoperation. A multivariable analysis compared wound morbidity for suture and mesh repairs while adjusting for defect width, fascial closure, and CDC wound class. RESULTS 120 patients were identified. Mean follow-up was 3.9 ± 3.4 years. Seventy-five (62.5%) of the masses were primary; most commonly desmoid (n = 25) and endometrioma (n = 27). Forty-five masses were metastases. Mean tumor width was 6.2 ± 3.4 cm; mean defect width was 8.1 ± 4.1 cm. Sixty-one patients (50.8%) had mesh placed, with variation in technique. Postoperative CT scans were available for 88 (73.3%) patients. Forty SSOs (33.3%), 11 SSIs (9.2%), and 18 (15%) SSOPIs occurred within 30 days. On multivariable analysis, increased defect width was associated with SSOPI (OR 1.17, p = 0.041) and CDC wound class II-III was associated with SSI (OR 8.38 and 49.1, p < 0.05) and SSOPI (OR 5.77 and 17.4, p < 0.05); mesh was not associated with these outcomes. Seven patients (5.8%) underwent 30-day reoperations and 35 (20.8%) required additional operations after 30 days. Thirteen percent developed abdominal wall (n = 8) or intra-abdominal tumor recurrence (n = 8) requiring reoperation. Twenty-seven (22.5%) patients developed hernias with a mean fascial defect width of 9.8 ± 7.2 cm. CONCLUSION Abdominal wall mass resections are morbid, often contaminated cases with high postoperative complication rates. Risks and benefits of mesh implantation should be tailored on an individual basis.
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Affiliation(s)
- S Maskal
- Department of Surgery, Cleveland Clinic, 2049 E 100th St, A-100, Cleveland, OH, 44106, USA.
| | - J Chang
- Department of Surgery, Cleveland Clinic, 2049 E 100th St, A-100, Cleveland, OH, 44106, USA
| | - R Ellis
- Department of Surgery, Cleveland Clinic, 2049 E 100th St, A-100, Cleveland, OH, 44106, USA
| | - N Messer
- Department of Surgery, Cleveland Clinic, 2049 E 100th St, A-100, Cleveland, OH, 44106, USA
| | - M Melland-Smith
- Department of Surgery, Cleveland Clinic, 2049 E 100th St, A-100, Cleveland, OH, 44106, USA
| | - C Tu
- Department of Surgery, Cleveland Clinic, 2049 E 100th St, A-100, Cleveland, OH, 44106, USA
| | - B Miller
- Department of Surgery, Cleveland Clinic, 2049 E 100th St, A-100, Cleveland, OH, 44106, USA
| | - C Petro
- Department of Surgery, Cleveland Clinic, 2049 E 100th St, A-100, Cleveland, OH, 44106, USA
| | - R Simon
- Department of Surgery, Cleveland Clinic, 2049 E 100th St, A-100, Cleveland, OH, 44106, USA
| | - A Prabhu
- Department of Surgery, Cleveland Clinic, 2049 E 100th St, A-100, Cleveland, OH, 44106, USA
| | - M Rosen
- Department of Surgery, Cleveland Clinic, 2049 E 100th St, A-100, Cleveland, OH, 44106, USA
| | - L Beffa
- Department of Surgery, Cleveland Clinic, 2049 E 100th St, A-100, Cleveland, OH, 44106, USA
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Said S, Thomas J, Montelione K, Fafaj A, Beffa L, Krpata D, Prabhu A, Rosen M, Petro C. Tanaka score predicts surgical intensive care admission following abdominal wall reconstruction. Hernia 2022; 26:873-880. [PMID: 35429304 DOI: 10.1007/s10029-022-02605-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 03/14/2022] [Indexed: 11/04/2022]
Abstract
PURPOSE With the advancement of abdominal wall reconstruction, more complex hernia patients are undergoing repairs that may require a postoperative surgical intensive care unit (SICU) admission. The volume ratio (VR) of the hernia sac to the abdominal cavity is an easily applied method to quantify disease severity and the ensuing physiologic insult. This study aimed to predict postoperative SICU admission using VR and other preoperative variables. METHODS A single-center retrospective review was conducted for patients undergoing large abdominal hernias (width ≥ 18 cm) repaired from September 2014 to October 2019. Patient demographics, comorbidities, abdominal surgical history, and VR were analyzed through univariate and multivariable methods to identify predictors of SICU admission within the first two postoperative days. A predictive model was generated and validated. RESULTS Of 434 patients meeting inclusion criteria, 127(29%) required a SICU admission within the first two postoperative days. VR was significantly higher in SICU patients (Median 30.6% [IQR 14.4-59.0] vs. 10.6% [IQR 4.35-23.6], P < 0.001). Male sex, history of chronic obstructive pulmonary disease, prior component separation, recurrent incisional hernia, hernia grade 3, and VR showed higher odds of SICU admission. When validated on a testing dataset, these variables showed strong SICU admission predictions, with an area under the curve, sensitivity, and specificity of 0.82, 81.7% and 68.5%, respectively. CONCLUSIONS The volume ratio in combination with preoperatively available variables can reliably predict postoperative SICU admission following abdominal wall reconstruction. Anticipating such events preoperatively allows for bed space allocation as well as optimizing postoperative care.
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Affiliation(s)
- S Said
- Department of General Surgery, Cleveland Clinic, Cleveland, OH, 44195, USA.
| | - J Thomas
- Department of General Surgery, Massachusetts General Hospital, Boston, MA, 02114, USA
| | - K Montelione
- Department of General Surgery, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - A Fafaj
- Department of General Surgery, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - L Beffa
- Department of General Surgery, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - D Krpata
- Department of General Surgery, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - A Prabhu
- Department of General Surgery, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - M Rosen
- Department of General Surgery, Cleveland Clinic, Cleveland, OH, 44195, USA
| | - C Petro
- Department of General Surgery, Cleveland Clinic, Cleveland, OH, 44195, USA
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Fafaj A, Tastaldi L, Alkhatib H, Tish S, AlMarzooqi R, Olson MA, Stewart TG, Petro C, Krpata D, Rosen M, Prabhu A. Is there an advantage to laparoscopy over open repair of primary umbilical hernias in obese patients? An analysis of the Americas Hernia Society Quality Collaborative (AHSQC). Hernia 2020; 25:579-585. [PMID: 32447534 DOI: 10.1007/s10029-020-02218-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Accepted: 05/11/2020] [Indexed: 12/28/2022]
Abstract
PURPOSE The most common techniques used to repair umbilical hernias are open and laparoscopic. As the obesity epidemic in the United States is growing, it is essential to understand how this morbidity affects umbilical hernia repairs. This study compares laparoscopic versus open umbilical hernia repairs in obese patients. METHODS All patients with body mass index (BMI) ≥ 30 kg/m2 who underwent elective, open or laparoscopic repair of a primary umbilical hernia with mesh were identified from the Americas Hernia Society Quality Collaborative (AHSQC). A retrospective review of the prospectively collected data was conducted. Outcomes of interest included surgical site infections (SSI), surgical site occurrences requiring procedural intervention (SSOPI), hernia-related quality-of-life survey (HerQles), and long-term recurrence. A logistic regression model was used to generate propensity scores. RESULTS Of 1507 patients who met the inclusion criteria, 322 were laparoscopic, and 1185 were open cases. The laparoscopic group had higher mean BMI (37 ± 6 vs. 35 ± 5 kg/m2 , P < 0.001 ) and mean hernia width (3 cm ± 1 vs. 2 cm ± 2, P < 0.001). Using a propensity score model, we controlled for several clinically relevant covariates. Propensity score adjustment showed no differences in the 30-day HerQles score (OR 0.93, 95% CI 0.58-1.49), SSI (OR 1.57, 95% CI 0.52-4.77), SSOPI (OR 2.85, 95% CI 0.84-9.62) or hernia recurrence (hazard ratio 0.86, 95% CI 0.50-1.49). CONCLUSION In obese patients with primary umbilical hernias, there is likely no benefit to laparoscopy over open umbilical hernia repair with mesh with regard to wound morbidity. Although, the long-term recurrence also showed no difference between these two approaches, overall follow up was lacking.
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Affiliation(s)
- A Fafaj
- Center for Abdominal Core Health, Digestive Disease and Surgery Institute, The Cleveland Clinic Foundation, 9500 Euclid Avenue, A-100, Cleveland, OH, 44195, USA.
| | - L Tastaldi
- Center for Abdominal Core Health, Digestive Disease and Surgery Institute, The Cleveland Clinic Foundation, 9500 Euclid Avenue, A-100, Cleveland, OH, 44195, USA
| | - H Alkhatib
- Center for Abdominal Core Health, Digestive Disease and Surgery Institute, The Cleveland Clinic Foundation, 9500 Euclid Avenue, A-100, Cleveland, OH, 44195, USA
| | - S Tish
- Center for Abdominal Core Health, Digestive Disease and Surgery Institute, The Cleveland Clinic Foundation, 9500 Euclid Avenue, A-100, Cleveland, OH, 44195, USA
| | - R AlMarzooqi
- Center for Abdominal Core Health, Digestive Disease and Surgery Institute, The Cleveland Clinic Foundation, 9500 Euclid Avenue, A-100, Cleveland, OH, 44195, USA
| | - M A Olson
- Department of Healthcare Policy and Research, Weill Cornell Medicine, New York, NY, USA
| | - T G Stewart
- Department of Biostatistics, Vanderbilt University Medical Center, Nashville, TN, USA
| | - C Petro
- Center for Abdominal Core Health, Digestive Disease and Surgery Institute, The Cleveland Clinic Foundation, 9500 Euclid Avenue, A-100, Cleveland, OH, 44195, USA
| | - D Krpata
- Center for Abdominal Core Health, Digestive Disease and Surgery Institute, The Cleveland Clinic Foundation, 9500 Euclid Avenue, A-100, Cleveland, OH, 44195, USA
| | - M Rosen
- Center for Abdominal Core Health, Digestive Disease and Surgery Institute, The Cleveland Clinic Foundation, 9500 Euclid Avenue, A-100, Cleveland, OH, 44195, USA
| | - A Prabhu
- Center for Abdominal Core Health, Digestive Disease and Surgery Institute, The Cleveland Clinic Foundation, 9500 Euclid Avenue, A-100, Cleveland, OH, 44195, USA
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4
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AlMarzooqi R, Tish S, Tastaldi L, Fafaj A, Olson M, Stewart T, Prabhu A, Krpata D, Petro C, Rosen M. Is concomitant cholecystectomy safe during abdominal wall reconstruction? An AHSQC analysis. Hernia 2020; 25:295-303. [PMID: 32417989 DOI: 10.1007/s10029-020-02208-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2019] [Accepted: 05/04/2020] [Indexed: 11/29/2022]
Abstract
PURPOSE Unlike routine ventral hernia repair, abdominal wall reconstruction (AWR) can results in large pieces of mesh and extensive manipulation of the intra-abdominal contents, rendering subsequent laparoscopic cholecystectomy challenging. This study addresses the additional wound morbidity of concomitant cholecystectomy. METHODS The Americas Hernia Society Quality Collaborative (AHSQC) was retrospectively reviewed and logistic regression modeling was used to control for multiple covariates. Patients that underwent open AWR with cholecystectomy were compared to a similar group of patients undergoing uncomplicated, open, clean, AWR alone. RESULTS 130 patients undergoing concomitant cholecystectomy were compared to a control group of 6440 patients. The addition of a cholecystectomy did not cause a significant change in wound morbidity (SSI: p = 0.16; SSOPI: p = 0.65). CONCLUSIONS This study noted that a concomitant cholecystectomy does not increase the wound morbidity as compared to an uncomplicated, clean, AWR. This provides support for consideration of routine cholecystectomy in patients with cholelithiasis undergoing AWR.
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Affiliation(s)
- R AlMarzooqi
- Comprehensive Hernia Center, Digestive Disease and Surgery Institute, Cleveland Clinic Foundation, Cleveland, OH, 44195, USA.
| | - S Tish
- Comprehensive Hernia Center, Digestive Disease and Surgery Institute, Cleveland Clinic Foundation, Cleveland, OH, 44195, USA
| | - L Tastaldi
- Comprehensive Hernia Center, Digestive Disease and Surgery Institute, Cleveland Clinic Foundation, Cleveland, OH, 44195, USA
| | - A Fafaj
- Comprehensive Hernia Center, Digestive Disease and Surgery Institute, Cleveland Clinic Foundation, Cleveland, OH, 44195, USA
| | - M Olson
- Department of Biostatistics, Vanderbilt University Medical Center, Nashville, TN, USA
| | - T Stewart
- Department of Biostatistics, Vanderbilt University Medical Center, Nashville, TN, USA
| | - A Prabhu
- Comprehensive Hernia Center, Digestive Disease and Surgery Institute, Cleveland Clinic Foundation, Cleveland, OH, 44195, USA
| | - D Krpata
- Comprehensive Hernia Center, Digestive Disease and Surgery Institute, Cleveland Clinic Foundation, Cleveland, OH, 44195, USA
| | - C Petro
- Comprehensive Hernia Center, Digestive Disease and Surgery Institute, Cleveland Clinic Foundation, Cleveland, OH, 44195, USA
| | - M Rosen
- Comprehensive Hernia Center, Digestive Disease and Surgery Institute, Cleveland Clinic Foundation, Cleveland, OH, 44195, USA
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5
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Liu L, Petro C, Majumder A, Fayezizadeh M, Anderson J, Novitsky YW. The use of Vicryl mesh in a porcine model to assess its safety as an adjunct to posterior fascial closure during retromuscular mesh placement. Hernia 2016; 20:289-95. [PMID: 26886013 DOI: 10.1007/s10029-016-1469-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Accepted: 02/05/2016] [Indexed: 11/28/2022]
Abstract
BACKGROUND Posterior component separation has become a common approach to complex abdominal wall reconstructions. This technique includes creation of an extraperitoneal retromuscular space for subsequent large synthetic mesh reinforcement. In certain cases, when complete restoration of "posterior" layer is precluded by significant tissue loss/damage, one proposed strategy is to replace the posterior fascia with an absorbable synthetic polyglactin (Vicryl) mesh. However, the safety of this strategy to prevent mesh-related visceral complication is unknown. Herein, we aimed to characterize mesh-viscera adhesion profiles and host tissue response of synthetic mesh either exposed directly to the viscera, or protected with Vicryl mesh. METHODS Using adult Yorkshire pigs, 5 × 5 cm pieces of mesh were secured to the intact peritoneum in each of the four quadrants (n = 6 pigs, 24 mesh samples). The study groups were Vicryl (V), Marlex (M), Softmesh (S), Marlex + Vicryl construct (MV), Softmesh + Vicryl construct (SV). The self-made composite meshes were then implanted with the Vicryl side facing the exposed viscera. The pigs were survived for 60 days. At necropsy, grossly, the extent and tenacity of visceral adhesions were evaluated using established scales. Histologically, all specimens for fibrous encapsulation on the visceral surface of the mesh were reviewed by an experienced pathologist blind to meshes used. RESULTS At necropsy, all Vicryl meshes were completely resorbed. The mean adhesion and tenacity scores for M and MV were 1.8 and 1.1 (P > 0.05), 2.0 and 1.5 (P > 0.05), respectively; while the mean adhesion extent scores and tenacity scores for S and SV were 2.0 and 1.2 (P > 0.05), 2.0 and 1.7 (P > 0.05). No significant difference in adhesion extent and tenacity was observed between Synthetic and Vicryl composite mesh groups. Histologically, Marlex + Vicryl mesh and Softmesh + Vicryl mesh constructs had thicker fibrous capsules than the corresponding unprotected Marlex and Soft mesh implants. Furthermore, visceral adhesions in the composite groups were noted to be to the fibrous capsule and not synthetic mesh itself. CONCLUSION Utilization of the absorbable polyglactin (Vicryl) mesh as a separating layer between a synthetic mesh and intestines, did not reduce adhesions across various mesh types and composites. Histologically, however, a thick fibrous capsule replaced the Vicryl mesh and may be an important layer to prevent intestinal erosion into retromuscular synthetic meshes.
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Affiliation(s)
- L Liu
- Department of Surgery, Case Comprehensive Hernia Center, University Hospitals Case Medical Center, Case Western Reserve University, 11100 Euclid Avenue, Cleveland, OH, 44106, USA.,Department of General Surgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - C Petro
- Department of Surgery, Case Comprehensive Hernia Center, University Hospitals Case Medical Center, Case Western Reserve University, 11100 Euclid Avenue, Cleveland, OH, 44106, USA
| | - A Majumder
- Department of Surgery, Case Comprehensive Hernia Center, University Hospitals Case Medical Center, Case Western Reserve University, 11100 Euclid Avenue, Cleveland, OH, 44106, USA
| | - M Fayezizadeh
- Department of Surgery, Case Comprehensive Hernia Center, University Hospitals Case Medical Center, Case Western Reserve University, 11100 Euclid Avenue, Cleveland, OH, 44106, USA
| | - J Anderson
- Department of Pathology, University Hospitals Case Medical Center, Cleveland, OH, USA
| | - Y W Novitsky
- Department of Surgery, Case Comprehensive Hernia Center, University Hospitals Case Medical Center, Case Western Reserve University, 11100 Euclid Avenue, Cleveland, OH, 44106, USA.
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6
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Novitsky Y, Fayezizadeh M, Majumder A, Yee S, Petro C, Orenstein S, Woeste G, Reinisch A, Bechstein WO, Rosen M, Carbonell A, Cobb W, Bauer J, Selzer D, Chao J, Harmaty M, Poulose B, Matthews B, Goldblatt M, Jacobsen G, Rosman C, Hansson B, Prabhu A, Fathi A, Skipworth J, Younis I, Floyd D, Shankar A, Olmi S, Cesana G, Ciccarese F, Uccelli M, Carrieri D, Castello G, Legnani G, Lyo V, Irwin C, Xu X, Harris H, Zuvela M, Galun D, Petrovic J, Palibrk I, Koncar I, Basaric D, Tian W, Fei Y, Pittman M, Jones E, Schwartz J, Mikami D, Perrakis A, Knüttel D, Klein P, Croner RS, Hohenberger W, Perrakis E, Müller V, Grande M, Villa M, Lisi G, Esser A, De Sanctis F, Petrella G, Birolini C, Miranda JS, Tanaka EY, Utiyama EM, Rasslan S, Shi Y, Guo XB, Zhuo HQ, Li LP, Liu HJ, Bauder A, Gerety P, Epps G, Pannucci C, Fischer J, Kovach S. Incisional Hernia: Difficult Cases 2. Hernia 2015; 19 Suppl 1:S105-11. [PMID: 26518784 DOI: 10.1007/bf03355335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Y Novitsky
- Case Comprehensive Hernia Center, Cleveland, USA
| | | | - A Majumder
- Case Comprehensive Hernia Center, Cleveland, USA
| | - S Yee
- Case Comprehensive Hernia Center, Cleveland, USA
| | - C Petro
- Case Comprehensive Hernia Center, Cleveland, USA
| | - S Orenstein
- Case Comprehensive Hernia Center, Cleveland, USA
| | - G Woeste
- Department of Surgery, Goethe University, Frankfurt, Germany
| | - A Reinisch
- Department of Surgery, Goethe University, Frankfurt, Germany
| | - W O Bechstein
- Department of Surgery, Goethe University, Frankfurt, Germany
| | - M Rosen
- Cleveland Clinic Foundation, Cleveland, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | - A Fathi
- Case Comprehensive Hernia Center, Cleveland, USA
| | - J Skipworth
- Hospital Complex Hernia Unit, Royal Free and University College London, London, UK
| | - I Younis
- Hospital Complex Hernia Unit, Royal Free and University College London, London, UK
| | - D Floyd
- Hospital Complex Hernia Unit, Royal Free and University College London, London, UK
| | - A Shankar
- Hospital Complex Hernia Unit, Royal Free and University College London, London, UK
| | - S Olmi
- School of General Surgery, University of Milan, Milan, Italy.,General and Oncologic Surgery Department, S. Marco Hospital, Zingonia, BG, Italy
| | - G Cesana
- School of General Surgery, University of Milan, Milan, Italy.,General and Oncologic Surgery Department, S. Marco Hospital, Zingonia, BG, Italy
| | - F Ciccarese
- School of General Surgery, University of Milan, Milan, Italy.,General and Oncologic Surgery Department, S. Marco Hospital, Zingonia, BG, Italy
| | - M Uccelli
- School of General Surgery, University of Milan, Milan, Italy.,General and Oncologic Surgery Department, S. Marco Hospital, Zingonia, BG, Italy
| | - D Carrieri
- General and Oncologic Surgery Department, S. Marco Hospital, Zingonia, BG, Italy
| | - G Castello
- General and Oncologic Surgery Department, S. Marco Hospital, Zingonia, BG, Italy
| | - G Legnani
- General and Oncologic Surgery Department, S. Marco Hospital, Zingonia, BG, Italy
| | - V Lyo
- Division of General Surgery, University of California San Francisco, San Francisco, USA
| | - C Irwin
- Division of Plastic & Reconstructive Surgery, University of California San Francisco, San Francisco, USA
| | - X Xu
- Division of Plastic & Reconstructive Surgery, University of California San Francisco, San Francisco, USA
| | - H Harris
- Division of General Surgery, University of California San Francisco, San Francisco, USA
| | - M Zuvela
- Clinical center of Serbia, University Clinic for Digestive Surgery, Belgrade, Serbia.,Medical School, University of Belgrade, Belgrade, Serbia
| | - D Galun
- Clinical center of Serbia, University Clinic for Digestive Surgery, Belgrade, Serbia.,Medical School, University of Belgrade, Belgrade, Serbia
| | - J Petrovic
- Clinical center of Serbia, University Clinic for Digestive Surgery, Belgrade, Serbia
| | - I Palibrk
- Medical School, University of Belgrade, Belgrade, Serbia.,Clinical center of Serbia, Clinic for vascular and endovascular surgery, Belgrade, Serbia
| | - I Koncar
- Clinical center of Serbia, University Clinic for Digestive Surgery, Belgrade, Serbia.,Medical School, University of Belgrade, Belgrade, Serbia
| | - D Basaric
- Clinical center of Serbia, University Clinic for Digestive Surgery, Belgrade, Serbia
| | - W Tian
- Department of General Surgery, 1st affiliated hospital of PLA general hospital, Beijing, China
| | | | - M Pittman
- The Ohio State University Medical Center, Columbus, USA
| | | | | | | | - A Perrakis
- Department of Surgery, University Hospital of Erlangen, Erlangen, Germany
| | - D Knüttel
- Department of Surgery, University Hospital of Erlangen, Erlangen, Germany
| | - P Klein
- Department of Surgery, University Hospital of Erlangen, Erlangen, Germany
| | - R S Croner
- Department of Surgery, University Hospital of Erlangen, Erlangen, Germany
| | - W Hohenberger
- Department of Surgery, University Hospital of Erlangen, Erlangen, Germany
| | - E Perrakis
- Department of Surgery, Omilos Iatrikoo Kentrou Athinon, Iatriko Kentro Peristeriou, Athens, Greece
| | - V Müller
- Department of Surgery, University Hospital of Erlangen, Erlangen, Germany
| | - M Grande
- University Hospital of Tor Vergata, Rome, Italy
| | - M Villa
- University Hospital of Tor Vergata, Rome, Italy
| | - G Lisi
- University Hospital of Tor Vergata, Rome, Italy
| | - A Esser
- University Hospital of Tor Vergata, Rome, Italy
| | | | - G Petrella
- University Hospital of Tor Vergata, Rome, Italy
| | - C Birolini
- Abdominal Wall and Hernia Surgery, University of São Paulo, School of Medicine, São Paulo, Brazil
| | - J S Miranda
- Abdominal Wall and Hernia Surgery, University of São Paulo, School of Medicine, São Paulo, Brazil
| | - E Y Tanaka
- Abdominal Wall and Hernia Surgery, University of São Paulo, School of Medicine, São Paulo, Brazil
| | - E M Utiyama
- Abdominal Wall and Hernia Surgery, University of São Paulo, School of Medicine, São Paulo, Brazil
| | - S Rasslan
- Abdominal Wall and Hernia Surgery, University of São Paulo, School of Medicine, São Paulo, Brazil
| | - Y Shi
- Department of Gastrointestinal Surgery, Provincial Hospital Affiliated to Shandong University, Jinan, China
| | | | | | | | | | - A Bauder
- Division of Plastic Surgery, University of Pennsylvania, Philadelphia, USA
| | - P Gerety
- Division of Plastic Surgery, University of Pennsylvania, Philadelphia, USA
| | - G Epps
- Division of Plastic Surgery, University of Pennsylvania, Philadelphia, USA
| | - C Pannucci
- Division of Plastic and Reconstructive Surgery, University of Utah, Salt Lake City, USA
| | - J Fischer
- Division of Plastic Surgery, University of Pennsylvania, Philadelphia, USA
| | - S Kovach
- Division of Plastic Surgery, University of Pennsylvania, Philadelphia, USA
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