[1] Womens Coll Hosp, Womens Coll Res Inst, Toronto, ON, Canada
[2] Univ Western Ontario, Fac Hlth Sci, London, ON, Canada
[3] St Michaels Hosp, Div Endocrinol & Metab, Toronto, ON M5B 1W8, Canada
[4] Univ Toronto, Dept Med, Toronto, ON, Canada
[5] Sunnybrook Hlth Sci Ctr, Toronto, ON M4N 3M5, Canada
[6] Univ Toronto, Inst Hlth Policy Management & Evaluat, Toronto, ON, Canada