1. Departments of Paediatric Endocrinology (H.L.C.-v.d.G., B.J.O.), Radboud University Nijmegen Medical Centre, 6500 HB Nijmegen, The Netherlands
2. Department of Chemical Endocrinology (F.C.G.J.S., P.N.S., H.A.R.), Radboud University Nijmegen Medical Centre, 6500 HB Nijmegen, The Netherlands
3. Department of Urology (E.J.H.M.), Radboud University Nijmegen Medical Centre, 6500 HB Nijmegen, The Netherlands
4. Department of Endocrinology (A.R.M.M.H.), Radboud University Nijmegen Medical Centre, 6500 HB Nijmegen, The Netherlands