[1] Univ Oxford, George Inst Global Hlth, 75 George St,Hayes House, Oxford OX1 2BQ, England
[2] Univ Turku, Dept Med, Turku, Finland
[3] Univ Minnesota, Sch Med, Dept Pediat, Minneapolis, MN 55455 USA
[4] Univ Iowa, Coll Publ Hlth, Dept Epidemiol, Iowa City, IA USA
[5] Univ Colorado, Sch Med, Childrens Hosp Colorado, Dept Pediat, Aurora, CO USA
[6] Univ Cincinnati, Med Ctr, Childrens Hosp, Cincinnati, OH 45267 USA
[7] Univ Minnesota, Sch Publ Hlth, Div Epidemiol & Community Hlth, Minneapolis, MN USA
[8] Univ Turku, Ctr Populat Hlth Res, Turku, Finland
[9] Univ Turku, Turku Univ Hosp, Res Ctr Appl & Prevent Cardiovasc Med, Turku, Finland
[10] Turku Univ Hosp, Dept Clin Physiol & Nucl Med, Turku, Finland