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van Stein RM, Hendriks FJ, Retèl VP, de Kroon CD, Lok CA, Sonke GS, de Ligt KM, van Driel WJ. Health state utility and health-related quality of life measures in patients with advanced ovarian cancer. Gynecol Oncol Rep 2023; 50:101293. [PMID: 38029226 PMCID: PMC10630623 DOI: 10.1016/j.gore.2023.101293] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 10/09/2023] [Accepted: 10/14/2023] [Indexed: 12/01/2023] Open
Abstract
Purpose Measuring health-related quality of life (HRQoL) in ovarian cancer patients is critical to understand the impact of disease and treatment. Preference-based HRQoL measures, called health state utilities, are used specifically in health economic evaluations. Real-world patient-reported data on HRQoL and health state utilities over the long-term course of ovarian cancer are limited. This study aims to determine HRQoL and health state utilities in different health states of ovarian cancer. Methods This cross-sectional, multicenter study included patients with stage III-IV ovarian cancer in six health states: at diagnosis, during chemotherapy, after cytoreductive surgery (CRS), after chemotherapy, in remission, and at first recurrence. HRQoL was measured using the European Organization for Research and Treatment of Cancer Core Quality of Life Questionnaire C30, and the ovarian cancer-specific module OV28. Health state utilities were assessed using the EuroQol five-dimension five-level (EQ-5D-5L) questionnaire. Descriptive analyses were performed for each health state. Results Two hundred thirty-two patients participated, resulting in 319 questionnaires. Median age was 66 years. The lowest HRQoL was observed during chemotherapy and shortly after CRS. Physical and role functioning were most affected and the highest symptom prevalence was observed in the fatigue, nausea, pain, dyspnea, gastrointestinal, neuropathy, attitude, and sexuality domains. Patients in remission had the best HRQoL. Mean utility values ranged from 0.709 (±0.253) at diagnosis to 0.804 (±0.185) after chemotherapy. Conclusions This study provides clinicians with a valuable resource to aid in patient counseling and clinical decision-making. The utilities, in particular, are crucial for researchers conducting economic analyses to inform policy decisions.
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Affiliation(s)
- Ruby M. van Stein
- Department of Gynecologic Oncology, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
| | - Florine J. Hendriks
- Department of Gynecology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands
| | - Valesca P. Retèl
- Department of Psychosocial Research and Epidemiology, Department of Psychosocial Research, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
- Erasmus School of Health Policy and Management, Erasmus University Rotterdam, Rotterdam, The Netherlands
| | - Cor D. de Kroon
- Department of Gynecology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA Leiden, The Netherlands
| | - Christianne A.R. Lok
- Department of Gynecologic Oncology, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
| | - Gabe S. Sonke
- Department of Medical Oncology, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
| | - Kelly M. de Ligt
- Department of Psychosocial Research and Epidemiology, Department of Psychosocial Research, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
| | - Willemien J. van Driel
- Department of Gynecologic Oncology, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
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van Stein RM, Aronson SL, Sikorska K, Hendriks FJ, Hovinga EP, Houwink API, Schutte PFE, Schooneveldt MS, De Kroon CD, Sonke GS, van Driel WJ. Is routine admission to a critical care setting following hyperthermic intraperitoneal chemotherapy for ovarian cancer necessary? Eur J Surg Oncol 2023; 49:107084. [PMID: 37812982 DOI: 10.1016/j.ejso.2023.107084] [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: 12/23/2022] [Revised: 07/17/2023] [Accepted: 09/14/2023] [Indexed: 10/11/2023]
Abstract
INTRODUCTION Hyperthermic intraperitoneal chemotherapy (HIPEC) is increasingly being used in patients with stage III ovarian cancer undergoing interval cytoreductive surgery (CRS). It is uncertain whether routine postoperative admission to a critical care setting after CRS-HIPEC is necessary. This study aims to estimate the incidence of patients requiring critical care, and to create a prediction model to identify patients who may forego admission to a critical care setting. METHODS We analyzed 154 patients with primary ovarian cancer undergoing interval CRS-HIPEC at two Dutch centers between 2007 and 2021. Patients were routinely admitted to a critical care setting for 12-24 h. Patients that received critical support as defined by pre-specified definitions were retrospectively identified. Logistic regression analysis with backward selection was used to predict the need for critical care and the model was validated using bootstrapping. RESULTS Thirty-eight percent of patients received postoperative critical care, consisting mainly of hemodynamic interventions. Independent predictors of critical care were blood loss, norepinephrine dose during surgery, and age (bootstrapped AUC = 0.76). Using a probability cut-off of 20%, one-third of patients are defined as low-risk for requiring critical care, with a negative predictive value of 0.88. CONCLUSIONS The majority of patients,primarily undergoing low to intermediate complexity surgeries, did not receive critical care interventions after CRS-HIPEC. Selective admission to a critical care setting may be warranted and its feasibility and safety needs to be evaluated prospectively. Our prediction model can help identify patients in whom admission to a critical care setting may be omitted. Hospital costs and burden on critical care units will benefit from patient selection.
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Affiliation(s)
- Ruby M van Stein
- Dept. of Gynecologic Oncology, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Plesmanlaan 121, 1066 CX, Amsterdam, the Netherlands
| | - S Lot Aronson
- Dept. of Gynecologic Oncology, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Plesmanlaan 121, 1066 CX, Amsterdam, the Netherlands; Dept. of Medical Oncology, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Plesmanlaan 121, 1066 CX, Amsterdam, the Netherlands
| | - Karolina Sikorska
- Dept. of Biometrics Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Plesmanlaan 121, 1066 CX, Amsterdam, the Netherlands
| | - Florine J Hendriks
- Dept. of Gynecology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA, Leiden, the Netherlands
| | - Els P Hovinga
- Dept. of Gynecologic Oncology, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Plesmanlaan 121, 1066 CX, Amsterdam, the Netherlands
| | - Aletta P I Houwink
- Dept. of Anesthesiology and Intensive Care, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Plesmanlaan 121, 1066 CX, Amsterdam, the Netherlands
| | - Peter F E Schutte
- Dept. of Anesthesiology and Intensive Care, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Plesmanlaan 121, 1066 CX, Amsterdam, the Netherlands
| | - Maaike S Schooneveldt
- Dept. of Anesthesiology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA, Leiden, the Netherlands
| | - Cor D De Kroon
- Dept. of Gynecology, Leiden University Medical Center, Albinusdreef 2, 2333 ZA, Leiden, the Netherlands
| | - Gabe S Sonke
- Dept. of Medical Oncology, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Plesmanlaan 121, 1066 CX, Amsterdam, the Netherlands
| | - Willemien J van Driel
- Dept. of Gynecologic Oncology, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Plesmanlaan 121, 1066 CX, Amsterdam, the Netherlands.
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van Stein RM, Sikorska K, van der Aa MA, Sonke GS, van Driel WJ, van Gent MDJM, van Ham MAPC, Hermans RHM, de Hingh IHJT, Schreuder HWR. Evaluation of external validity of the OVHIPEC-1 trial in a real-world population. Int J Gynaecol Obstet 2022; 161:640-648. [PMID: 36495280 DOI: 10.1002/ijgo.14618] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Revised: 10/31/2022] [Accepted: 12/07/2022] [Indexed: 12/14/2022]
Abstract
OBJECTIVE The OVHIPEC-1 trial (Phase III randomised clinical trial for stage III ovarian carcinoma randomising between interval cytoreductive surgery with or without hyperthermic intraperitoneal chemotherapy) showed improved survival when interval cytoreductive surgery (CRS) was combined with hyperthermic intraperitoneal chemotherapy in patients with stage III epithelial ovarian cancer (EOC). The authors compared the control arm of the trial with a real-world population treated in the Netherlands during the same period to explore generalizability of the trial results. METHODS For this nationwide comparative cohort study, all patients with EOC undergoing interval CRS between 2007 and 2016 were identified from the Netherlands Cancer Registry if they fulfilled the eligibility criteria of OVHIPEC-1 (n = 1376). Patient and treatment characteristics, and overall survival (OS) were compared between trial and real-world populations. RESULTS Age, comorbidity, BRCA status, histologic subtype, and residual disease were similar in trial and real-world patients. Trial patients had a better performance status, higher socioeconomic status, and underwent bowel surgery more often. In a real-world setting, patients more often received more than six cycles. The difference in OS between the trial and the real-world populations was not statistically significant (unadjusted hazard ratio, 1.09 [95% confidence interval, 0.87-1.37]; P = 0.44). CONCLUSION Despite differences in patient characteristics, OS of patients treated in the control arm of OVHIPEC-1 was similar to patients treated outside the trial. The trial population accurately represents real-world patients with stage III EOC undergoing interval CRS in terms of outcome.
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Affiliation(s)
- Ruby M van Stein
- Department of Gynecologic Oncology, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Amsterdam, The Netherlands
| | - Karolina Sikorska
- Department of Biometrics, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Amsterdam, The Netherlands
| | - Maaike A van der Aa
- Department of Research & Development, Netherlands Comprehensive Cancer Organization (IKNL), Utrecht, The Netherlands
| | - Gabe S Sonke
- Department of Medical Oncology, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Amsterdam, The Netherlands
| | - Willemien J van Driel
- Department of Gynecologic Oncology, Netherlands Cancer Institute - Antoni van Leeuwenhoek Hospital, Amsterdam, The Netherlands
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van Stein RM, Lok CA, Aalbers AG, H.J.T. de Hingh I, Houwink AP, Stoevelaar HJ, Sonke GS, van Driel WJ. Standardizing HIPEC and perioperative care for patients with ovarian cancer in the Netherlands using a Delphi-based consensus. Gynecol Oncol Rep 2022; 39:100945. [PMID: 35252523 PMCID: PMC8894234 DOI: 10.1016/j.gore.2022.100945] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 02/18/2022] [Accepted: 02/22/2022] [Indexed: 12/29/2022] Open
Abstract
Implementation of HIPEC for ovarian cancer is ongoing, aiming to offer this treatment to all eligible patients in the Netherlands. Standardization reduces unwanted variation in clinical treatment. We intend to standardize patient selection, technical aspects, and perioperative care of CRS and HIPEC. This consensus study comprised a two-phase modified Delphi approach. Consensus was reached on 82% of items.
Objective Hyperthermic Intraperitoneal Chemotherapy (HIPEC) is standard of care in the Netherlands in patients with stage III epithelial ovarian cancer following interval cytoreductive surgery (CRS). Differences in patient selection, technical aspects, and perioperative management exist between centers performing HIPEC. Standardization aims to reduce unwanted variation in clinical practice. As part of an implementation process, we aimed to standardize perioperative care for patients treated with CRS and HIPEC using a Delphi-based consensus approach. Methods We performed a two-phase modified Delphi method involving a multidisciplinary panel of 40 experts who completed a survey on CRS and HIPEC. During a consensus meeting, survey outcomes and available scientific evidence was discussed. Items without consensus (<75% agreement) were adjusted and evaluated in a second survey. Results Consensus was reached in the first round on 51% of items. After two rounds, consensus was reached on the majority of items (82%) including patient selection, preoperative workup, technical aspects of CRS and HIPEC, and postoperative care. No consensus was reached on the role of HIPEC in rare ovarian cancer types, preoperative bowel preparation, timing to create bowel anastomoses, and manipulation of the perfusate. Conclusions Dutch experts reached consensus on most items regarding interval CRS and HIPEC for ovarian cancer. This consensus study may help to align treatment protocols and to minimize practice variation. Topics without consensus may be put on the research agenda of HIPEC for ovarian cancer.
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van Driel WJ, Aronson SL, van Stein RM, Sonke GS. Turning up the heat does not affect quality of life. J Gynecol Oncol 2022; 33:e68. [PMID: 35775690 PMCID: PMC9250849 DOI: 10.3802/jgo.2022.33.e68] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Accepted: 06/15/2022] [Indexed: 11/30/2022] Open
Affiliation(s)
- Willemien J. van Driel
- Department of Gynaecological Oncology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, the Netherlands
| | - S. Lot Aronson
- Department of Gynaecological Oncology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, the Netherlands
- Department of Medical Oncology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, the Netherlands
| | - Ruby M. van Stein
- Department of Gynaecological Oncology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, the Netherlands
| | - Gabe S. Sonke
- Department of Medical Oncology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, the Netherlands
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Abstract
Importance The peritoneal surface is a common site of disease in ovarian and colorectal cancer. Peritoneal metastases carry a poor prognosis, despite maximal therapeutic efforts, including surgical removal of tumor deposits and intravenous chemotherapy. Hyperthermic intraperitoneal chemotherapy (HIPEC) is a single intraoperative procedure that delivers chemotherapy directly into the abdominal cavity, leading to high intracellular drug concentration at the peritoneal surface. This review describes the current knowledge regarding the mechanism of action, safety, and efficacy of HIPEC in the treatment of peritoneal metastases from epithelial ovarian and colorectal cancers and explores current knowledge gaps. Observations Toxic effects of HIPEC are limited. Evidence from a randomized trial shows improved recurrence-free and overall survival after HIPEC in patients with ovarian cancer who are ineligible for primary cytoreductive surgery (CRS). The effect of HIPEC for patients with ovarian cancer undergoing primary CRS or CRS for recurrent disease has not yet been determined, and results of ongoing trials must be awaited. A recent study in patients with peritoneal metastases from colorectal cancer did not show a benefit of HIPEC when added to perioperative chemotherapy. Conclusions and Relevance Based on available evidence, various international guidelines include the option to add HIPEC to interval CRS for patients with stage III ovarian cancer. The role of HIPEC in colorectal cancer is less well defined. Future studies will need to tailor patient selection, timing, and optimal regimens of HIPEC to improve the effectiveness of this specialized treatment in ovarian, colorectal, and other tumor types.
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Affiliation(s)
- Ruby M van Stein
- Department of Gynecologic Oncology, The Netherlands Cancer Institute, Amsterdam
| | - Arend G J Aalbers
- Department of Surgical Oncology, The Netherlands Cancer Institute, Amsterdam
| | - Gabe S Sonke
- Department of Medical Oncology, The Netherlands Cancer Institute, Amsterdam
| | - Willemien J van Driel
- Center for Gynecologic Oncology Amsterdam, The Netherlands Cancer Institute, Amsterdam
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van Stein RM, Koole SN, Sikorska K, Barton DP, Perrin L, Brennan D, Zivanovic O, Mosgaard BJ, Fagotti A, Colombo PE, Retel VP, Sonke GS, Van Driel WJ. Primary cytoreductive surgery with or without Hyperthermic Intraperitoneal Chemotherapy (HIPEC) for FIGO stage III epithelial ovarian cancer: The OVHIPEC-2 trial in progress. J Clin Oncol 2020. [DOI: 10.1200/jco.2020.38.15_suppl.tps6100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
TPS6100 Background: The addition of Hyperthermic Intraperitoneal Chemotherapy (HIPEC) to interval cytoreductive surgery improves recurrence-free and overall survival in patients with FIGO stage III ovarian cancer who are ineligible for primary cytoreductive surgery due to extensive intraperitoneal disease. The effect of HIPEC remains undetermined in patients who are eligible for primary cytoreductive surgery. We hypothesize that the addition of HIPEC to a complete or near-complete (residual disease ≤2.5 mm) primary cytoreductive surgery improves overall survival in patients with FIGO stage III ovarian cancer. Methods: This international, randomized, open-label, phase III trial enrolls patients with newly diagnosed, histological proven FIGO stage III epithelial ovarian, fallopian tube, or primary peritoneal cancer. Patients with resectable umbilical, spleen or local bowel lesions may be included. Following complete or near-complete primary cytoreduction, patients are intra-operatively randomized (1:1) to receive HIPEC or no HIPEC. Patients in both study arms will receive six courses of adjuvant carboplatin-paclitaxel and maintenance PARP-inhibitor or bevacizumab according to current guidelines. The primary endpoint is overall survival. To detect a Hazard Ratio of 0.67 in favor of HIPEC, 200 overall survival events are required. Assuming that accrual will be completed in 60 months, and 12 months additional follow-up, 538 patients need to be randomized. All randomized patients will be included in the analysis for overall survival according to the intention to treat principle. Pre-specified subgroup analyses will be performed based on stratification factors (peritoneal cancer index at start of surgery, completeness of surgery), histologic subtype (high-grade serous versus other), and BRCA mutation (BRCA1/2 mutation versus wildtype). Secondary endpoints are recurrence-free survival, time to first subsequent anticancer treatment, and treatment related complications and toxicity. Exploratory endpoints are time to second subsequent anticancer treatment, health-related quality of life, and cost-effectiveness. The Institutional Review Board of the Netherlands Cancer Institute approved the trial, which is actively enrolling patients since January 2020. Clinical trial information: NCT03772028.
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Affiliation(s)
| | | | - Karolina Sikorska
- Department of Statistics, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, Netherlands
| | | | - Lewis Perrin
- Queensland Centre for Gynecological Cancer, Brisbane, Australia
| | | | | | | | - Anna Fagotti
- Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy
| | | | | | - Gabe S. Sonke
- DGOG and Department of Medical Oncology, The Netherlands Cancer Institute, Amsterdam, Netherlands
| | - Willemien J. Van Driel
- Department of Gynaecologic Oncology, The Netherlands Cancer Institute, Amsterdam, Netherlands
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Berkhout DJC, Benninga MA, van Stein RM, Brinkman P, Niemarkt HJ, de Boer NKH, de Meij TGJ. Effects of Sampling Conditions and Environmental Factors on Fecal Volatile Organic Compound Analysis by an Electronic Nose Device. Sensors (Basel) 2016; 16:E1967. [PMID: 27886068 PMCID: PMC5134625 DOI: 10.3390/s16111967] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2016] [Revised: 10/27/2016] [Accepted: 11/17/2016] [Indexed: 12/17/2022]
Abstract
Prior to implementation of volatile organic compound (VOC) analysis in clinical practice, substantial challenges, including methodological, biological and analytical difficulties are faced. The aim of this study was to evaluate the influence of several sampling conditions and environmental factors on fecal VOC profiles, analyzed by an electronic nose (eNose). Effects of fecal sample mass, water content, duration of storage at room temperature, fecal sample temperature, number of freeze-thaw cycles and effect of sampling method (rectal swabs vs. fecal samples) on VOC profiles were assessed by analysis of totally 725 fecal samples by means of an eNose (Cyranose320®). Furthermore, fecal VOC profiles of totally 1285 fecal samples from 71 infants born at three different hospitals were compared to assess the influence of center of origin on VOC outcome. We observed that all analyzed variables significantly influenced fecal VOC composition. It was feasible to capture a VOC profile using rectal swabs, although this differed significantly from fecal VOC profiles of similar subjects. In addition, 1285 fecal VOC-profiles could significantly be discriminated based on center of birth. In conclusion, standardization of methodology is necessary before fecal VOC analysis can live up to its potential as diagnostic tool in clinical practice.
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Affiliation(s)
- Daniel J C Berkhout
- Department of Pediatric Gastroenterology, Emma Children's Hospital/Academic Medical Center, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands.
- Department of Pediatric Gastroenterology, VU University Medical Center, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands.
| | - Marc A Benninga
- Department of Pediatric Gastroenterology, Emma Children's Hospital/Academic Medical Center, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands.
| | - Ruby M van Stein
- Department of Pediatric Gastroenterology, VU University Medical Center, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands.
| | - Paul Brinkman
- Department of Respiratory Medicine, Academic Medical Center, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands.
| | - Hendrik J Niemarkt
- Neonatal Intensive Care Unit, Máxima Medical Center, De Run 4600, 5504 DB Veldhoven, The Netherlands.
| | - Nanne K H de Boer
- Department of Gastroenterology and Hepatology, VU University Medical Center, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands.
| | - Tim G J de Meij
- Department of Pediatric Gastroenterology, VU University Medical Center, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands.
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