[1] University of Groningen,School of Medicine
[2] University Medical Centre Groningen,Department of Surgery
[3] Medical Centre Leeuwarden,Center for Obesity Northern Netherlands
[4] Medical Center Leeuwarden,Department of Gastrointestinal Surgery
[5] Ghent University Hospital,Department of Human Structure and Repair
[6] Ghent University,Weight Management Center, Department of Surgery
[7] NMC Royal Hospital,Department of Epidemiology
[8] Medical Center Leeuwarden,Department of Epidemiology
[9] University of Groningen,undefined
[10] University Medical Center Groningen,undefined