[1] Vrije Univ Amsterdam, Med Ctr, Dept Hlth Sci, EMGO Inst,Inst Hlth Sci, NL-1081 BT Amsterdam, Netherlands
[2] Vrije Univ Amsterdam, Inst Hlth Sci, Dept Hlth Econ & Hlth Technol Assessment, NL-1081 BT Amsterdam, Netherlands
[3] Univ Sydney, Sydney, NSW 2006, Australia
[4] George Inst Int Hlth, Musculoskeletal Div, Sydney, NSW, Australia
[5] EMGO Inst, Dept Epidemiol & Biostat, Amsterdam, Netherlands