1. Hospital for Children and Adolescents (A.M.W., L.D.), Helsinki University Central Hospital, University of Helsinki, FI-00029 Helsinki, Finland
2. University Department of Growth and Reproduction (C.E.H.-H., E.R.-D.M.), Rigshospitalet, DK-2100 Copenhagen, Denmark
3. Department of Pediatrics (L.D.), Kuopio University Hospital, University of Kuopio, FI-70211 Kuopio, Finland