[1] Univ Hlth Network, Dept Med, Toronto, ON M5G 2C4, Canada
[2] Univ Toronto, Dept Med, Toronto, ON M5S 1A8, Canada
[3] Univ Toronto, Inst Hlth Policy Management & Evaluat, Toronto, ON M5T 3M6, Canada
[4] Univ Chile, Fac Dent, Evidence Based Dent Unit, Santiago 1058, Chile
[5] Univ Toronto, Dept Publ Hlth Sci, Toronto, ON M5T 3M6, Canada
[6] Univ Hlth Network, Dept Psychiat, Toronto, ON M5G 2C4, Canada
[7] Sunnybrook Hlth Sci Ctr, Dept Med Oncol, Toronto, ON M4N 3M5, Canada
[8] Univ Alberta, Dept Med, Edmonton, AB T6G 2G3, Canada