[1] European Hlth Econ, SE-11120 Stockholm, Sweden
[2] Karolinska Inst, Med Management Ctr, Stockholm, Sweden
[3] Merck & Co Inc, Outcomes Res, Whitehouse Stn, NJ USA
[4] Katholieke Univ Leuven, Leuven Univ Ctr Metab Bone Dis, Louvain, Belgium
[5] Katholieke Univ Leuven, Div Geriatr Med, Louvain, Belgium
[6] Vrije Univ Brussel, Acad Ziekenhuis, Dept Orthopaed & Traumatol, Brussels, Belgium
[7] Malmo Gen Hosp, Dept Orthopaed, S-21401 Malmo, Sweden
[8] Univ Sheffield, Sch Med, Ctr Metab Bone Dis, WHO Collaborating Ctr, Sheffield, S Yorkshire, England