[1] Univ Turku, Res Ctr Appl & Prevent Cardiovasc Med, Turku, Finland
[2] Univ Turku, Dept Clin Physiol & Nucl Med, Turku, Finland
[3] Univ Turku, Dept Med, Turku, Finland
[4] Turku Univ Hosp, FIN-20520 Turku, Finland
[5] Univ Tasmania, Menzies Res Inst Tasmania, Hobart, Tas, Australia
[6] Tulane Univ, Tulane Ctr Cardiovasc Hlth, New Orleans, LA 70118 USA
[7] Univ Iowa, Coll Publ Hlth, Dept Epidemiol, Iowa City, IA USA
[8] Univ Iowa, Carver Coll Med, Dept Neurol, Iowa City, IA USA
[9] Murdoch Childrens Res Inst, Melbourne, Vic, Australia
[10] Univ Melbourne, Royal Childrens Hosp, Dept Paediat, Melbourne, Vic, Australia
[11] Univ Colorado, Denver & Hlth Sci Ctr, Dept Pediat, Aurora, CO USA
[12] Univ Tampere, Dept Clin Physiol, FIN-33101 Tampere, Finland
[13] Tampere Univ Hosp, Tampere, Finland
[14] Univ Oulu, Dept Pediat, SF-90100 Oulu, Finland
[15] Vaasa Cent Hosp, Vaasa, Finland
[16] Cincinnati Childrens Hosp, Med Ctr, Dept Pediat, Cincinnati, OH USA