1. Department of Radiology, University of British Columbia, Vancouver, BC, Canada
2. Orthopedic Clinic, University of Oslo, Oslo, Norway
3. Oslo Sports Trauma Research Center, Norwegian School of Sport Sciences, Oslo, Norway
4. Medical and Scientific Department, International Olympic Committee, Lausanne, Switzerland
5. Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart Lung and Blood Vessel Disease, Beijing, China