1. Department of Endocrinology; University of Groningen, University Medical Center Groningen; The Netherlands
2. Department of Internal Medicine, Martini Hospital; Groningen The Netherlands
3. Department of Endocrinology; Medical Center Leeuwarden; Leeuwarden The Netherlands
4. Department of Gynecology and Obstetrics; University of Groningen, University Medical Center Groningen; The Netherlands