[1] Tufts Univ, Childrens Hosp, Sch Med, Springfield, MA 01199 USA
[2] Royal Manchester Childrens Hosp, Dept Child Hlth, Manchester M27 4HA, Lancs, England
[3] Pfizer, S-19190 Stockholm, Sweden
[4] Univ Gothenburg, Pediat Growth Res Ctr, S-40439 Gothenburg, Sweden
[5] Univ Tubingen, Childrens Hosp, Pediat Endocrinol Sect, D-72076 Tubingen, Germany