[1] Univ Leipzig, Hosp Children & Adolescents, D-04317 Leipzig, Germany
[2] Middlesex Hosp, Cobbold Labs, London, England
[3] Karolinska Inst, Karolinska Hosp, S-10401 Stockholm, Sweden
[4] Univ Chicago, Wyler Childrens Hosp, Chicago, IL 60637 USA
[5] Univ Parma, Dept Pediat, I-43100 Parma, Italy
[6] Rigshosp, Dept Growth & Reprod, DK-2100 Copenhagen, Denmark
[7] Univ Rotterdam, Sophia Childrens Hosp, Div Endocrinol, Rotterdam, Netherlands
[8] Univ Liege, Div Pediat & Adolescent Med, Liege, Belgium