1. Division of Pediatric Endocrinology, Department of Pediatrics, Erasmus MC-Sophia, P.O. Box 2060, 3000 CB Rotterdam, The Netherlands
2. Division of Pediatric Endocrinology, Department of Pediatrics, Ghent University and University Hospital Ghent, De Pintelaan 185, 9000 Ghent, Belgium
3. Department of Obstetrics and Gynaecology, Radboud University Nijmegen Medical Center, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands
4. Department of Urology, Erasmus MC-Sophia, P.O. Box 1738, 3000 CB Rotterdam, The Netherlands