[1] Univ Toronto, Dept Family & Community Med, 7335 Yonge St, Toronto, ON, Canada
[2] Family Phys Airways Grp Canada, Edmonton, AB, Canada
[3] Observat & Pragmat Res Inst, Singapore, Singapore
[4] Univ Aberdeen, Div Appl Hlth Sci, Ctr Acad Primary Care, Aberdeen, Scotland