1. Centro de Investigaciones Endocrinológicas (H.M.D., P.A.S., P.B., M.G., H.G.J.), Hospital de Niños “R. Gutiérrez,” 1425 Buenos Aires, Argentina
2. Pediatric Endocrinology and Metabolism (A.L., S.K.), Mayo Clinic, Rochester, Minnesota 55095
3. Endocrinology (F.H.M.), Children’s Hospital of Western Ontario, London, Canada N6A 4G5
4. Medical Research Laboratories (J.F.), Clinical Institute, Aarhus University Hospital, DK-8000 Aarhus, Denmark