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