Affiliation: | 1. Division of Orthopaedic Surgery, Department of Surgery, McMaster University, Hamilton, Ontario;2. Department of Clinical Epidemiology and Biostatistics, McMaster University, Hamilton, Ontario, Canada;3. Department of Orthopaedic Surgery, Stanford University Medical Center, Redwood City, California;4. Minnesota Orthopaedic Sports Medicine Institute at Twin Cities Orthopedics, Edina, Minnesota, U.S.A. |