[1] Univ British Columbia, James Hogg Res Ctr, Vancouver, BC V5Z 1M9, Canada
[2] Univ British Columbia, Dept Phys Therapy, Vancouver, BC V5Z 1M9, Canada
[3] McMaster Univ, Dept Pediat, Hamilton, ON, Canada
[4] Univ British Columbia, BC Childrens Hosp, Div Pediat Emergency Med, Dept Pediat, Vancouver, BC V5Z 1M9, Canada
[5] Univ British Columbia, Dept Pediat, Vancouver, BC V6T 1W5, Canada
[6] Child & Family Res Inst, Pharmaceut Outcomes Programme, Vancouver, BC, Canada
[7] BC Childrens Hosp, Qual & Risk Management, Vancouver, BC V5Z 4H4, Canada