[1] Univ Gothenburg, Sch Publ Hlth & Community Med, Gen Practice,Family Med, Inst Med,Sahlgrenska Acad, Box 454, S-40530 Gothenburg, Sweden
[2] Reg Vastra Gotaland, Res Educ Dev & Innovat, Primary Hlth Care, Gothenburg, Sweden
[3] Reg Vastra Gotaland, Dept Child Hlth Serv, Gothenburg, Sweden
[4] Uppsala Univ, Dept Publ Hlth & Caring Sci, Child Hlth & Parenting CHAP, Uppsala, Sweden