1. Department of Pulmonology, Medical Center Leeuwarden, Leeuwarden, The Netherlands;
2. Department of Orthopedic Surgery and Traumatology, Isala Hospital, Zwolle, The Netherlands;
3. Postgraduate School of Medicine, University Medical Center Groningen, Groningen, The Netherlands;
4. Department of Obstetrics and Gynaecology, Martini Hospital, Groningen, The Netherlands;
5. Department of Epidemiology, MCL academy, Medical Center Leeuwarden, Leeuwarden, The Netherlands;
6. Department of Urology, Catharina Hospital, Eindhoven, The Netherlands;
7. The Vincent Van Gogh Institute for Psychiatry, Venray, The Netherlands;
8. MCL Academy, Medical Center Leeuwarden, Leeuwarden, The Netherlands