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Warsop ZI, Manzo CA, Yu N, Yusuf B, Kontovounisios C, Celentano V. Patient-reported Outcome Measures in Ileoanal Pouch Surgery: a Systematic Review. J Crohns Colitis 2024; 18:479-487. [PMID: 37758036 DOI: 10.1093/ecco-jcc/jjad163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 09/14/2023] [Accepted: 09/21/2023] [Indexed: 10/03/2023]
Abstract
OBJECTIVE To summarise frequency, type, and heterogeneity of patient-reported outcomes measures [PROMs] in papers reporting on outcomes after ileal pouch anal anastomosis [IPAA]. BACKGROUND Prevalence of ulcerative colitis [UC] has risen in Western countries, and one in three patients requires surgery. IPAA is a frequently performed procedure for UC, and a lack of standardisation is manifest in reporting outcomes for inflammatory bowel disease [IBD] despite the clear need for inclusion of PROMs as primary outcomes in IBD trials. METHODS Scopus, Pubmed, and Web of Science databases were searched from January 2010 to January 2023 for studies investigating outcomes in IPAA surgery. The primary outcome was the proportion of studies reporting outcomes for IPAA surgery for UC, which included PROMs. RESULTS The search identified a total of 8028 studies which, after de-duplication and exclusion, were reduced to 79 articles assessing outcomes after IPAA surgery. In all 44 [55.7%] reported PROMs, with 23 including validated questionnaires and 21 papers using authors' questions, 22 different PROMs were identified, with bowel function as the most investigated item. The majority of studies [67/79, 85%] were retrospective, only 14/79 [18%] were prospective papers and only two were [2.5%] randomised, controlled trials. CONCLUSIONS Only half of the papers reviewed used PROMs. The main reported item is bowel function and urogenital, social, and psychological functions are the most neglected. There is lack of standardisation for use of PROMs in IPAA. Complexity of UC and of outcomes after IPAA demands a change in clinical practice and follow-up, given how crucial PROMs are, compared with their non-routine use.
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Affiliation(s)
| | - Carlo Alberto Manzo
- Imperial College London School of Medicine, London, UK
- Department of Colorectal Surgery, Chelsea and Westminster Hospital NHS Foundation Trust, London, UK
| | - Natalie Yu
- Imperial College London School of Medicine, London, UK
| | - Bilal Yusuf
- Imperial College London School of Medicine, London, UK
| | - Christos Kontovounisios
- Department of Colorectal Surgery, Chelsea and Westminster Hospital NHS Foundation Trust, London, UK
- Department of Colorectal Surgery, Royal Marsden NHS Foundation Trust, London, UK
- Department of Surgery and Cancer, Imperial College London, London, UK
| | - Valerio Celentano
- Department of Colorectal Surgery, Chelsea and Westminster Hospital NHS Foundation Trust, London, UK
- Department of Surgery and Cancer, Imperial College London, London, UK
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Akiyama S, Onoda T, Moue S, Sakamoto N, Sakamoto T, Suzuki H, Enomoto T, Matsubara D, Oda T, Tsuchiya K. Association of colonic metaplasia of goblet cells and endoscopic phenotypes of the J pouch in patients with ulcerative colitis: a retrospective pilot study. Intest Res 2024; 22:92-103. [PMID: 38327000 PMCID: PMC10850699 DOI: 10.5217/ir.2023.00105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 09/17/2023] [Accepted: 09/21/2023] [Indexed: 02/09/2024] Open
Abstract
BACKGROUND/AIMS Mucosal adaptation of the ileum toward colonic epithelium has been reported in pouchitis in ulcerative colitis (UC); however, the clinical characteristics, endoscopic findings, and outcomes in patients with pouchitis with ileal mucosal adaptation are poorly understood. METHODS This was a single-center retrospective study comprising UC patients treated by proctocolectomy with ileal pouch-anal anastomosis who had undergone pouchoscopy at the University of Tsukuba Hospital between 2005 and 2022. Endoscopic phenotypes were evaluated according to the Chicago classification. High-iron diamine staining (HID) was performed to identify sulfomucin (colon-type mucin)-producing goblet cells (GCs) in pouch biopsies. We compared clinical data between patients with (high HID group) and without > 10% sulfomucin-producing GCs in at least one biopsy (low HID group). RESULTS We reviewed 390 endoscopic examination reports from 50 patients. Focal inflammation was the most common phenotype (78%). Five patients (10%) required diverting ileostomy. Diffuse inflammation and fistula were significant risk factors for diverting ileostomy. The median proportion of sulfomucin-producing GCs on histological analysis of 82 pouch biopsies from 23 patients was 9.9% (range, 0%-93%). The duration of disease was significantly greater in the high HID group compared to the low HID group. The median percentage of sulfomucin-producing GCs was significantly higher in patients with diffuse inflammation or fistula compared to other endoscopic phenotypes (14% vs. 6.0%, P= 0.011). CONCLUSIONS Greater proportions of sulfomucin-producing GCs were observed in endoscopic phenotypes associated with poor outcomes in UC, indicating patients with pouchitis showing colonic metaplasia of GCs may benefit from early interventions.
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Affiliation(s)
- Shintaro Akiyama
- Department of Gastroenterology, Institute of Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Tsubasa Onoda
- Department of Gastroenterology, Institute of Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Shoko Moue
- Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery, Institute of Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Noriaki Sakamoto
- Department of Pathology, Institute of Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Taku Sakamoto
- Department of Gastroenterology, Institute of Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Hideo Suzuki
- Department of Gastroenterology, Institute of Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Tsuyoshi Enomoto
- Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery, Institute of Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Daisuke Matsubara
- Department of Pathology, Institute of Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Tatsuya Oda
- Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery, Institute of Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
| | - Kiichiro Tsuchiya
- Department of Gastroenterology, Institute of Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
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Lavryk OA, Shawki S, Hull TL, Holubar SD, Kanters A, Steele SR. Does the age of ulcerative colitis diagnosis impact outcomes of restorative proctocolectomy? Int J Colorectal Dis 2023; 38:241. [PMID: 37768400 DOI: 10.1007/s00384-023-04521-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 09/08/2023] [Indexed: 09/29/2023]
Abstract
BACKGROUND Ulcerative colitis (UC) can be diagnosed at a variety of different ages. We evaluated if age of ulcerative colitis (UC) diagnosis impacts outcomes of restorative proctocolectomy (RP) with ileal pouch-anal anastomosis (IPAA). METHODS A prospectively maintained pouch database (1983-2020) was queried to identify patients undergoing an RP for UC. The cohort was stratified based on bimodal disease presentation into 2 groups: the early adulthood group (19-30 years old) and the mid/late adulthood group (40-70 years old). Patients' demographics, postoperative complications, functional (stool number, seepage), and quality of life (QoL) rates were compared between the groups. RESULTS A total of 628 patients with an age range of 19-30 years old (18.1 ± 2.2 at the time of diagnosis, 24.2 ± 10.5 at the time of IPAA) and 706 patients with an age range of 40-70 years old (45 ± 3.0 at time of diagnosis, 52.3 ± 9.4 at time of IPAA) were identified. Older patients had longer disease duration, higher BMI, lower biologic use, and greater one-/two-staged IPAA, with 20% hand sewn anastomosis and 16.5% of S pouch configuration compared to younger ones. No difference was observed in anastomotic separation, pelvic sepsis, fistulas, or pouch failure in follow-up. Postoperatively, older patients more frequently developed bowel obstructions, strictures, and pouchitis, in addition to higher rates of seepage (p < 0.05). QoL was comparable between groups. CONCLUSION While IPAA retention rates are comparable between different age cohorts, older age at diagnosis and IPAA construction is associated with higher rates of pouchitis, bowel obstruction, anastomotic strictures, and worse functional outcome. Quality of life is similar in those who retain their ileal pouch on the long-term.
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Affiliation(s)
- Olga A Lavryk
- Department of Colorectal Surgery, Cleveland Clinic, Cleveland, OH, USA.
| | - Sherief Shawki
- Department of Colorectal Surgery, Mayo Clinic, Rochester, MN, USA
| | - Tracy L Hull
- Department of Colorectal Surgery, Cleveland Clinic, Cleveland, OH, USA
| | - Stefan D Holubar
- Department of Colorectal Surgery, Cleveland Clinic, Cleveland, OH, USA
| | - Arielle Kanters
- Department of Colorectal Surgery, Cleveland Clinic, Cleveland, OH, USA
| | - Scott R Steele
- Department of Colorectal Surgery, Cleveland Clinic, Cleveland, OH, USA
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Hassan Y, Connell WR, Rawal A, Wright EK. Review of long-term complications and functional outcomes of ileoanal pouch procedures in patients with inflammatory bowel disease. ANZ J Surg 2023. [PMID: 37095321 DOI: 10.1111/ans.18490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 04/12/2023] [Accepted: 04/16/2023] [Indexed: 04/26/2023]
Abstract
BACKGROUND In medically refractory Ulcerative Colitis (UC), proctocolectomy with ileoanal pouch procedure (IAPP) is the preferred continence-preserving surgical option. Functional outcomes post-surgery and long-term complication rates in the biologic era remain ambiguous. This review primarily aims to provide an update on these outcomes. Secondarily, risk factors associated with chronic pouchitis and pouch failure are explored. METHODS Two online databases (MEDLINE and EMBASE) were searched on 4 October 2022 for English studies from 2011-present relating to long-term outcomes of IAPP in inflammatory bowel disease (IBD) patients. Adult patients with 12 month follow-up were included. Studies focused on 30-day post-operative outcomes, non-IBD patients or studies including less than 30 patients were excluded. RESULTS Following screening and full-text review of 1094 studies, 49 were included. Median sample size was n = 282 (IQR: 116-519). Median incidences for chronic pouchitis and pouch failure were 17.1% (IQR: 12-23.6%) and 6.9% (IQR: 4.8-10.8%), respectively. Upon multivariate analysis, chronic pouchitis development was most significantly associated with pre-operative steroid use, pancolitis and extra-intestinal IBD manifestations, whilst pouch failure was most significantly associated with pre-operative diagnosis of Crohn's disease (compared to UC), peri-operative pelvic sepsis and anastomotic leak. Overall patient satisfaction was very high with four included studies reporting greater than 90% satisfaction rates. CONCLUSION Long-term complications for IAPP were common. However, despite this, patient satisfaction post-IAPP was high. Up-to-date knowledge of complication rates and their risk factors improves pre-operative counselling, management planning and patient outcomes.
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Affiliation(s)
- Yusuf Hassan
- Melbourne Medical School, University of Melbourne, Melbourne, Australia
| | - William R Connell
- Department of Gastroenterology, St Vincent's Hospital, Melbourne, Australia
| | - Alisha Rawal
- General HMO Stream, Grampians Health, Ballarat, Australia
| | - Emily K Wright
- Melbourne Medical School, University of Melbourne, Melbourne, Australia
- Department of Gastroenterology, St Vincent's Hospital, Melbourne, Australia
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Westberg K, Olén O, Söderling J, Bengtsson J, Ludvigsson JF, Everhov ÅH, Myrelid P, Nordenvall C. Primary Versus Staged Reconstruction and Risk of Surgical Failure in Patients With Ulcerative Colitis: a Nation-wide Cohort Study. Inflamm Bowel Dis 2022; 28:1301-1308. [PMID: 34792582 DOI: 10.1093/ibd/izab263] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Indexed: 12/17/2022]
Abstract
BACKGROUND Restorative surgery after colectomy due to ulcerative colitis (UC) may be performed simultaneously with colectomy (primary) or as a staged procedure. Risk factors for failure after restorative surgery are not fully explored. This study aimed to compare the risk of failure after primary and staged reconstruction. METHODS This is a national register-based cohort study of all patients 15 to 69 years old in Sweden treated with colectomy due to UC and who received an ileorectal anastomosis (IRA) or ileal pouch-anal anastomosis (IPAA) between 1997 and 2017. Failure was defined as a reoperation with new ileostomy after restorative surgery or a remaining defunctioning ileostomy after 2 years. Risk of failure was calculated using the Kaplan-Meier method and Cox regression adjusted for sex, age, calendar period, primary sclerosing cholangitis, and duration of UC. RESULTS Of 2172 included patients, 843 (38.8%) underwent primary reconstruction, and 1329 (61.2%) staged reconstruction. Staged reconstruction was associated with a decreased risk of failure compared with primary reconstruction (hazard ratio, 0.73; 95% CI, 0.58-0.91). The 10-year cumulative risk of failure was 15% vs 20% after staged and primary reconstruction, respectively. In all, 1141 patients (52.5%) received an IPAA and 1031 (47.5%) an IRA. In stratified multivariable models, staged reconstruction was more successful than primary reconstruction in both IRA (hazard ratio, 0.75; 95% CI, 0.54-1.04) and IPAA (hazard ratio, 0.73; 95% CI, 0.52-1.01), although risk estimates failed to attain statistical significance. CONCLUSIONS In UC patients undergoing colectomy, postponing restorative surgery may decrease the risk of failure.
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Affiliation(s)
- Karin Westberg
- Department of Molecular Medicine and Surgery, Karolinska Institutet and Division of Surgery, Danderyd Hospital, Stockholm, Sweden
| | - Ola Olén
- Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet and Department of Pediatric Gastroenterology and Nutrition, Sachs' Children and Youth Hospital, Stockholm, Sweden
| | - Jonas Söderling
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
| | - Jonas Bengtsson
- Department of Surgery, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Jonas F Ludvigsson
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm and Department of Pediatrics, Örebro University Hospital, Örebro, Sweden
| | - Åsa H Everhov
- Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet and Department of Clinical Science and Education, Södersjukhuset, Stockholm, Sweden
| | - Pär Myrelid
- Department of Surgery, Linköping University Hospital and Department of Biomedical and Clinical Sciences, Faculty of Health, Linköping University, Linköping, Sweden
| | - Caroline Nordenvall
- Department of Molecular Medicine and Surgery, Karolinska Institutet and Department of Pelvic Cancer, Karolinska University Hospital, Stockholm, Sweden
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Alsafi Z, Snell A, Segal JP. Prevalence of 'pouch failure' of the ileoanal pouch in ulcerative colitis: a systematic review and meta-analysis. Int J Colorectal Dis 2022; 37:357-364. [PMID: 34825957 PMCID: PMC8803821 DOI: 10.1007/s00384-021-04067-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/10/2021] [Indexed: 02/04/2023]
Abstract
BACKGROUND AND AIMS The ileoanal pouch (IPAA) provides patients with ulcerative colitis (UC) that have not responded to medical therapy an option to retain bowel continuity and defecate without the need for a long-term stoma. Despite good functional outcomes, some pouches fail, requiring permanent diversion, pouchectomy, or a redo pouch. The incidence of pouch failure ranges between 2 and 15% in the literature. We conducted a systematic review and meta-analysis aiming to define the prevalence of pouch failure in patients with UC who have undergone IPAA using population-based studies. METHODS We searched Embase, Embase classic and PubMed from 1978 to 31st of May 2021 to identify cross-sectional studies that reported the prevalence of pouch failure in adults (≥ 18 years of age) who underwent IPAA for UC. RESULTS Twenty-six studies comprising 23,389 patients were analysed. With < 5 years of follow-up, the prevalence of pouch failure was 5% (95%CI 3-10%). With ≥ 5 but < 10 years of follow-up, the prevalence was 5% (95%CI 4-7%). This increased to 9% (95%CI 7-16%) with ≥ 10 years of follow-up. The overall prevalence of pouch failure was 6% (95%CI 5-8%). CONCLUSIONS The overall prevalence of pouch failure in patients over the age of 18 who have undergone restorative proctocolectomy in UC is 6%. These data are important for counselling patients considering this operation. Importantly, for those patients with UC being considered for a pouch, their disease course has often resulted in both physical and psychological morbidity and hence providing accurate expectations for these patients is vital.
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Affiliation(s)
| | - Alice Snell
- Surrey and Sussex Healthcare NHS Trust, Redhill, UK
| | - Jonathan P Segal
- Department of Gastroenterology, Imperial College Healthcare NHS Trust, London, UK
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Risto A, Abdalla M, Myrelid P. Staging Pouch Surgery in Ulcerative Colitis in the Biological Era. Clin Colon Rectal Surg 2022; 35:58-65. [PMID: 35069031 PMCID: PMC8763463 DOI: 10.1055/s-0041-1740039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Restorative proctocolectomy, or ileal pouch anal anastomosis, is considered the standard treatment for intractable ulcerative colitis. When the pelvic pouch was first introduced in 1978, a two-stage procedure with proctocolectomy, construction of the pelvic pouch, and a diverting loop with subsequent closure were suggested. Over the decades that the pelvic pouch has been around, some principal technical issues have been addressed to improve the method. In more recent days the laparoscopic approach has been additionally introduced. During the same time-period the medical arsenal has developed far more with the increasing use of immune modulators and the introduction of biologicals. Staging of restorative proctocolectomy with a pelvic pouch refers to how many sessions, or stages, the procedure should be divided into. The main goal with restorative proctocolectomy is a safe operation with optimal short- and long-term function. In this paper we aim to review the present knowledge and views on staging of the pouch procedure in ulcerative colitis, especially with consideration to the treatment with biologicals.
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Affiliation(s)
- Anton Risto
- Department of Surgery, Linköping University Hospital and Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Maie Abdalla
- Department of Surgery, Vrinnevi Hospital, Norrköping and Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
| | - Pär Myrelid
- Department of Surgery, Linköping University Hospital and Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden,Address for correspondence Pär Myrelid, MD, PhD Department of Surgery, Linköping University HospitalSE-581 85 LinköpingSweden
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Xu W, Tang W, Ding W, Hu H, Chen W, Qian Q, Cui L, Ding Z, Du P. Preoperative Endoscopic Activity Predicts the Occurrence of Pouchitis After Ileal Pouch-Anal Anastomosis in Ulcerative Colitis: A Multicenter Retrospective Study in China. Front Surg 2021; 8:740349. [PMID: 34631785 PMCID: PMC8496748 DOI: 10.3389/fsurg.2021.740349] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 08/24/2021] [Indexed: 01/31/2023] Open
Abstract
Background: Pouchitis is the most common long-term complication after ileal pouch–anal anastomosis (IPAA) in patients with ulcerative colitis (UC). Ulcerative colitis endoscopic index of severity (UCEIS) and Mayo endoscopic score (MES) are widely used indices to evaluate endoscopic activity. This study aimed to clarify the predictive value of preoperative endoscopic activity on the occurrence of pouchitis after IPAA. Methods: Data of patients with UC who underwent IPAA from January 2008 to January 2020 were collected retrospectively. UCEIS and MES were based on the preoperative colonoscopy findings of two independent endoscopists. Results: A total of 102 patients with a median follow-up of 5 (interquartile range, 2–9) years were included in the study. Among them, 21.6% developed pouchitis. Compared with MES, UCEIS had a stronger correlation with pouchitis disease activity index. UCEIS ≥ 7 had the most significant receiver-operating characteristic (ROC) curve area of 0.747 with a sensitivity of 68.2% and specificity of 81.2% in predicting pouchitis, which outperformed MES of 3 with an ROC area of 0.679 with a sensitivity of 54.5% and specificity of 81.2%. Furthermore, we found that UCEIS ≥ 7 was an independent risk factor for post-IPAA pouchitis [odds ratio (OR), 8.860; 95% CI, 1.969–39.865, p < 0.001] with a higher risk than MES of 3 (OR, 5.200; 95% CI, 1.895–14.273; p = 0.001). Conclusion: Ulcerative colitis endoscopic index of severity performed better in predicting pouchitis after IPAA than MES. Earlier and more frequent postoperative colonoscopic surveillance should be considered in patients with preoperative UCEIS ≥ 7 to detect the occurrence of pouchitis earlier.
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Affiliation(s)
- Weimin Xu
- Department of Colorectal Surgery, School of Medicine, Xinhua Hospital, Shanghai Jiaotong University, Shanghai, China
| | - Wenbo Tang
- Department of Colorectal Surgery, School of Medicine, Xinhua Hospital, Shanghai Jiaotong University, Shanghai, China
| | - Wenjun Ding
- Department of Colorectal Surgery, School of Medicine, Xinhua Hospital, Shanghai Jiaotong University, Shanghai, China
| | - Hang Hu
- Department of Colorectal and Anal Surgery, Hubei Key Laboratory of Intestinal and Colorectal Diseases, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Wenhao Chen
- Department of Colorectal and Anal Surgery, Hubei Key Laboratory of Intestinal and Colorectal Diseases, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Qun Qian
- Department of Colorectal and Anal Surgery, Hubei Key Laboratory of Intestinal and Colorectal Diseases, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Long Cui
- Department of Colorectal Surgery, School of Medicine, Xinhua Hospital, Shanghai Jiaotong University, Shanghai, China
| | - Zhao Ding
- Department of Colorectal and Anal Surgery, Hubei Key Laboratory of Intestinal and Colorectal Diseases, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Peng Du
- Department of Colorectal Surgery, School of Medicine, Xinhua Hospital, Shanghai Jiaotong University, Shanghai, China
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