1. Dutch Growth Research Foundation (R.F.A.d.L.v.W., A.C.S.H.-K.), 3016 AH Rotterdam, The Netherlands
2. Erasmus University Medical Center Rotterdam/Sophia Children’s Hospital, Department of Pediatrics, Subdivisions of Endocrinology (R.F.A.d.L.v.W., A.C.S.H.-K.), 3015 GJ Rotterdam, The Netherlands
3. Intensive Care (K.F.M.J., S.v.d.B.), 3015 GJ Rotterdam, The Netherlands
4. Radboud University Nijmegen Medical Center (B.J.O.), Department of Pediatrics, Subdivision of Endocrinology, 6525 GA Nijmegen, The Netherlands
5. Erasmus University Medical Center Rotterdam, Department of Internal Medicine (F.H.d.J.), Laboratory of Endocrinology, 3015 GE Rotterdam, The Netherlands
6. Radboud University Nijmegen Medical Center (C.G.J.S.), Department of Chemical Endocrinology, 6525 GA Nijmegen, The Netherlands
7. Sleep Center SEIN (A.W.d.W.), 8025 BV Zwolle, The Netherlands