1. From the Division of Orthopaedic Surgery, University of Toronto, St. Michael’s Hospital, Toronto, Ontario, Canada, Hôpital Orthopédique de la Suisse Romande, CHUV, University of Lausanne, Lausanne, Switzerland, Department of Medicine, Mount Sinai Hospital and Department of Surgery, Martin Family Centre for Arthritis Care and Research, Mobility Program, St Michael’s Hospital, University of Toronto, Toronto, Ontario, Canada