1. Department of Surgery, Maastricht University Medical Centre and Nutrition and Toxicology Research Institute (NUTRIM), Maastricht University, Maastricht, The Netherlands
2. University College London Hospitals and University College London, Division of Surgery and Interventional Science, London, United Kingdom
3. Department of Surgery, Admiraal De Ruyter Ziekenhuis, Goes, the Netherlands
4. Department of Methodology and Statistics, Maastricht University, Maastricht, The Netherlands