[1] Dept Family Practice, Vancouver, BC V6T 1Z3, Canada
[2] Dept Hlth Care & Epidemiol, Vancouver, BC V6T 1Z3, Canada
[3] British Columbias Womens Hosp, Vancouver, BC V6H 3N1, Canada
[4] Hlth Ctr Osteoporosis Program, Vancouver, BC V6H 3N1, Canada
[5] Dept Emergency Med, Vancouver, BC V5Z 1M9, Canada
[6] Dept Orthoped, Vancouver, BC V5Z 1L8, Canada