[1] Natl Inst Hlth & Welf, Diabet Prevent Unit, Helsinki, Finland
[2] Univ Helsinki, Cent Hosp, Childrens Hosp, Helsinki, Finland
[3] Univ Helsinki, Helsinki, Finland
[4] Oulu Univ, Cent Hosp, Dept Obstet & Gynaecol, SF-90220 Oulu, Finland
[5] Univ Oulu, Oulu, Finland