1. Paediatric Endocrinology Unit, Hôpital Universitaire des Enfants Reine Fabiola; Brussels, Belgium.
2. Laboratory of Paediatric Research; Université Libre de Bruxelles, Brussels, Belgium.
3. Endocrinology Service and Research Center, Ste-Justine Hospital and Department of Paediatrics, Université de Montréal, Montréal, Québec, Canada.