[1] Univ Helsinki, Div Nutr, FIN-00014 Helsinki, Finland
[2] Tampere Sch Publ Hlth, Tampere, Finland
[3] Univ Helsinki, Hjelt Inst, FIN-00014 Helsinki, Finland
[4] Natl Inst Hlth & Welf, Dept Lifestyle & Participat, Nutr Unit, Helsinki, Finland
[5] Univ Turku, Immunogenet Lab, Turku, Finland
[6] Univ Eastern Finland, Dept Clin Microbiol, Kuopio, Finland
[7] Univ Turku, Dept Pediat, Turku, Finland
[8] Univ Oulu, Dept Pediat, Oulu, Finland
[9] Univ Helsinki, Childrens Hosp, FIN-00014 Helsinki, Finland
[10] Univ Helsinki, Cent Hosp, FIN-00014 Helsinki, Finland
[11] Folkhalsan Res Inst, Helsinki, Finland
[12] Tampere Univ Hosp, Dept Pediat, Tampere, Finland