[1] Univ Toronto, Dept Med, Div Physiatry, Toronto, ON, Canada
[2] Royal Coll Phys & Surg Canada, Ottawa, ON, Canada
[3] Univ Cincinnati, Coll Med, Internal Med & Pediat, Cincinnati, OH USA
[4] Univ Calif San Francisco, San Francisco, CA 94143 USA
[5] Baylor Coll Med, Pediat, Houston, TX 77030 USA
[6] Queens Univ, Dept Emergency Med, Kingston, ON, Canada
[7] Univ Alberta, Dept Family Med, Edmonton, AB, Canada
[8] Univ Saskatchewan, Dept Emergency Med, Saskatoon, SK, Canada
[9] Queens Univ, Dept Family Med, Kingston, ON, Canada