title: In response.
authors.affiliation: University of Calgary Spine Program and Department of Clinical Neurosciences, University of Calgary, Calgary, Alberta, Canada Division of Orthopedic Surgery, Dalhousie University, Halifax, Nova Scotia, Canada Division of Orthopedic Surgery, University of Western Ontario, London, Ontario, Canada Division of Orthopedic Surgery, University of Alberta, Edmonton, Alberta, Canada Division of Orthopedic Surgery, Dalhousie University, St. John, New Brunswick, Canada Division of Orthopedic Surgery, Trillium Health Centre, Mississauga, Ontario, Canada Division of Orthopedic Surgery, University of Montreal, Montreal, Quebec, Canada Division of Orthopedic Surgery, University of British Columbia, Vancouver, British Columbia, Canada.
authors.forename: R John
authors.initials: RJ
authors.lastname: Hurlbert
authors.forename: David
authors.initials: D
authors.lastname: Alexander
authors.forename: Stewart
authors.initials: S
authors.lastname: Bailey
authors.forename: James
authors.initials: J
authors.lastname: Mahood
authors.forename: Ed
authors.initials: E
authors.lastname: Abraham
authors.forename: Robert
authors.initials: R
authors.lastname: McBroom
authors.forename: Alain
authors.initials: A
authors.lastname: Jodoin
authors.forename: Charles
authors.initials: C
authors.lastname: Fisher