1. Department of Paediatrics (R.W.J.L., P.O., L.K.M.H., A.A.H., A.C.S.H.-K.), Division of Endocrinology, Erasmus Medical Centre-Sophia, Children’s Hospital, 3015 GJ Rotterdam, The Netherlands
2. Department of Epidemiology and Biostatistics (T.S.), Leiden University Medical Centre, 2333 ZA Leiden, The Netherlands