1. Department of Paediatrics (R.H.W., S.W.K.d.K., D.C.M.v.d.K., A.C.S.H.-K.), Division of Endocrinology, Erasmus MC Sophia, 3015 GJ Rotterdam, The Netherlands
2. Department of Dutch Growth Foundation (D.C.M.v.d.K., A.C.S.H.-K.), 3001 KB Rotterdam, The Netherlands