1. Department of Internal Medicine; Division of Endocrinology, Radboud University Medical Center; Nijmegen The Netherlands
2. Department of Human Genetics; Radboud University Medical Center; Nijmegen The Netherlands
3. Department of Internal Medicine; Slingeland Hospital; Doetinchem The Netherlands
4. Department of Internal Medicine; St Antonius Hospital; Nieuwegein The Netherlands
5. Department of Endocrinology and Metabolism; Academic Medical Centre; Amsterdam The Netherlands
6. Department of Internal Medicine; Division of Endocrinology, Erasmus Medical Center; Rotterdam The Netherlands