1. Division of Ambulatory Pediatrics and Adolescent Medicine (A.-S.P., J.-P.B.), University of Liège, B-4000 Liège, Belgium
2. Department of Growth and Reproduction (G.T., A.J., N.E.S.), Copenhagen University Hospital, Rigshospitalet, DK-2100 Copenhagen Ø, Denmark
3. Departments of Paediatrics and Physiology (J.T.), University of Turku, 20520 Turku, Finland