[1] Gothenburg Univ, Sahlgrenska Acad, Ctr Bone Res, Dept Internal Med, Gothenburg, Sweden
[2] Gothenburg Univ, Sahlgrenska Acad, Ctr Bone Res, Dept Geriatr, Gothenburg, Sweden
[3] Malmo Gen Hosp, Dept Orthopaed, S-21401 Malmo, Sweden
[4] Univ Uppsala, Dept Med Sci, Uppsala, Sweden
[5] Lund Univ, Dept Radiol, Lund, Sweden
[6] Oregon Hlth & Sci Univ, Bone & Mineral Unit, Portland, OR USA