[1] Univ Hlth Network, Schroeder Arthrit Inst, Toronto, ON, Canada
[2] Univ Hlth Network, Div Orthopaed Surg, Toronto, ON, Canada
[3] Univ Toronto, Dalla Lana Sch Publ Hlth, Inst Hlth Policy Management & Evaluat, Toronto, ON, Canada
[4] Horizon Hlth Network, St John Orthoped, Dept Orthopaed Surg, St John, NB, Canada
[5] Western Univ, Schulich Sch Med, London Hlth Sci Ctr Combined Orthopaed & Neurosur, London, ON, Canada
[6] Dalhousie Univ, Dept Surg Neurosurg, Halifax, NS, Canada
[7] Univ Calgary, Dept Surg, Calgary, AB, Canada
[8] Sunnybrook Hlth Sci Ctr, Spine Program, Toronto, ON, Canada
[9] Dalhousie Univ, Dept Surg, Halifax, NS, Canada
[10] Univ Manitoba, Dept Surg, Winnipeg, MB, Canada
[11] Univ Alberta, Dept Surg, Edmonton, AB, Canada
[12] Univ Laval, Ctr Rech, CHU Quebec, Quebec City, PQ, Canada
[13] Ottawa Hosp, Dept Surg, Civ Campus, Ottawa, ON, Canada
[14] McGill Univ, Dept Surg, Montreal, PQ, Canada
[15] Montreal Gen Hosp, Montreal, PQ, Canada
[16] Univ Calgary, Dept Surg, Calgary, AB, Canada
[17] Univ Toronto, Dept Surg, Toronto, ON, Canada
[18] Vancouver Gen Hosp, Vancouver Spine Surg Inst, Vancouver, BC, Canada
[19] Univ British Columbia, Blusson Spinal Cord Ctr, Vancouver, BC, Canada