Department of Gastroenterology and Hepatology University Medical Center Rotterdam 3015 GD;
Department of Surgery Hospital aan den IJssel 2906 ZC;
Department of Surgery University Medical Center Rotterdam 3015 GD;
Department of Gastroenterology and Hepatology Medical Center Groningen and University of Groningen 9713 GZ;
Department of Nutrition and Movement Sciences of Nutrition and Translational Research in Metabolism University 6200 MD;
Department of Epidemiology and Public Health Research Institute University 6200 MD;
Department of Anaesthesiology MC University Medical Center Rotterdam 3015 GD;
Department of Surgery University Medical Center 6229 HX;
Crohn’s disease; Prehabilitation strategies; Nutrition; Physical fitness; Medication; Laboratory values;