1. University of Groningen, University Medical Center Groningen; Department of Endocrinology; Hanzeplein 1 Groningen Netherlands 9713 GZ
2. Isala Oncological Center; Department of Internal Medicine; PO Box 10400 Zwolle Netherlands 8000 GK
3. University of Groningen, University Medical Center Groningen; Department of Internal Medicine; Hanzeplein 1 Groningen Netherlands 9700 RB
4. University of Groningen, University Medical Center Groningen; Laboratory Medicine; Hanzeplein 1 Groningen Netherlands 9700 RB
5. Eindhoven University of Technology; Department of Mathematics and Computer Science; P.O. Box 513 Eindhoven Netherlands 5600 MB
6. University Medical Center Groningen; Onocological Surgery; Hanzeplein 1 Groningen Netherlands 9713 GZ