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Contributors CD and SR conceived and designed the study with input from the other authors. EPJGN, SWOD, CD and HMHvE collected the data. EPJGN and SSR wrote the first draft of the paper. CD, EEB and SSR supervised the project and funded this study. EPJGN, SSR and HMHvE analysed the data. All authors interpreted the data and contributed to the writing of the paper. All authors revised and approved the final version.
Funding This study was funded by TI Food and Nutrition, a public–private partnership on precompetitive research in food and nutrition research. Partners are key players in the global food industry, leading research institutes, universities and medical centres.
Disclaimer The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Competing interests None declared.
Patient consent Obtained
Ethics approval This study was approved by the Medical Ethics Committee of Maastricht University Medical Centre (MEC 11-3-084) and was conducted according to the ethical standards of the Helsinki Declaration of 1975 and in accordance with the Medical Research Involving Human Subjects Act (WMO). All patients provided verbal and written informed consent before surgery.
Provenance and peer review Not commissioned; externally peer reviewed.
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