[1] Univ Helsinki, Inst Behav Sci, FIN-00014 Helsinki, Finland
[2] Univ Helsinki, Dept Gen Practice & Primary Hlth Care, FIN-00014 Helsinki, Finland
[3] Helsinki Univ Cent Hosp, Childrens Hosp, Helsinki, Finland
[4] Natl Inst Hlth & Welf, Helsinki, Finland
[5] Vasa Cent Hosp, Vaasa, Finland
[6] Helsinki Univ Cent Hosp, Unit Gen Practice, Helsinki, Finland
[7] Folkhalsan Res Ctr, Helsinki, Finland