1. 1Medical Research Council Epidemiology UnitCambridge CB0 2QQ, UK
2. 2Department of PediatricsUniversity of Cambridge, Cambridge CB0 2QQ , UK
3. 3Department of Woman and ChildUniversity of Leuven, 3000 Leuven, Belgium
4. 4DiabetesEndocrinology and Nutrition Unit, Dr Josep Trueta Hospital, 17007 Girona, Spain
5. 5Endocrinology UnitHospital Sant Joan de Déu, University of Barcelona, Passeig de Sant Joan de Déu, 2, 08950 Esplugues, Barcelona, Spain