Affiliation: | (1) Department of Paediatrics, Endocrinology Division, University Hospital for Children and Youth Het Wilhelmina Kinderziekenhuis , P. O. Box 18009, 3501 CA Utrecht, The Netherlands;(2) Orthopaedic Surgery, University Hospital for Children and Youth Het Wilhelmina Kinderziekenhuis , P. O. Box 18009, 3501 CA Utrecht, The Netherlands;(3) Department of Neuromuscular Disease, University Hospital, Utrecht, The Netherlands |