[1] Sahlgrens Univ Hosp, Dept Radiol, Gothenburg, Sweden
[2] Gothenburg Univ, Sahlgrenska Acad, Dept Publ Hlth & Community Med, Unit Primary Hlth Care, S-41124 Gothenburg, Sweden
[3] Gothenburg Univ, Sahlgrenska Acad, Inst Hlth & Caring Sci, S-41124 Gothenburg, Sweden