1. Endocrinology Unit (L.I., A.F., F.R-H.), 08950 Esplugues, Barcelona, Spain
2. Hormonal Laboratory (C.V.), Hospital Sant Joan de Déu, University of Barcelona, 08950 Esplugues, Barcelona, Spain
3. Endocrinology Unit (M.V.M.), Consorci Hospitalari de Terrassa, 08227 Terrassa, Spain
4. Department of Paediatrics (F.d.Z.), University of Leuven, 3000 Leuven, Belgium