[1] McGill Univ, Fac Med & Hlth Sci, Montreal, PQ, Canada
[2] Univ Alberta, Sch Publ Hlth, Edmonton, AB, Canada
[3] Nova Scotia Hlth, Halifax, NS, Canada
[4] Univ Saskatchewan, Saskatoon, SK, Canada
[5] Univ Toronto, Toronto, ON, Canada
[6] Alberta SPOR Support Unit, Calgary, AB, Canada
[7] McGill Univ, Montreal, PQ, Canada
[8] Univ Victoria, Victoria, BC, Canada
[9] Dalhousie Univ, Sch Med, Div Digest Care & Endoscopy, QEII Victoria Bldg,Suite 915 Victoria Bldg, Halifax, NS B3H 2Y9, Canada