1. Departments of Pediatric Endocrinology (R.F.A.d.L.v.W., D.A.M.F., A.C.S.H.-K.), Erasmus University Medical Center/Sophia Children's Hospital, 3015 GJ Rotterdam, The Netherlands
2. Dutch Growth Research Foundation (R.F.A.d.L.v.W., D.A.M.F., A.C.S.H.-K.), 3016 AH Rotterdam, The Netherlands
3. Department of Pediatric Endocrinology (B.J.O.), Radboud University Nijmegen Medical Center, 6525 GA Nijmegen, The Netherlands
4. Departments of Pediatric Intensive Care (K.F.M.J.), Erasmus University Medical Center/Sophia Children's Hospital, 3015 GJ Rotterdam, The Netherlands
5. Department of Internal Medicine (F.H.d.J.), Laboratory of Endocrinology, Erasmus University Medical Center, 3015 GE Rotterdam, The Netherlands
6. Department of Chemical Endocrinology (F.C.G.J.S.), Radboud University Nijmegen Medical Center, 6525 GA Nijmegen, The Netherlands