| Affiliation: | 1. Institute for Evaluative Research in Medicine, Stauffacherstrasse 78, 3014 Bern, Switzerland;2. Spine Centre Division, Department of Teaching, Research and Development, Schulthess Klinik, Lengghalde 2, CH-8008 Zurich, Switzerland;3. Comparative Effectiveness, Cost and Outcome Research Centre, University of Washington, 4333 Brooklyn Ave NE, Seattle, WA 98104, USA;4. Department of Orthopaedic Surgery, Salem Spital, Schänzlistrasse 39, Bern 3025, Switzerland;1. Department of Orthopedics, National Taiwan University College of Medicine and National Taiwan University Hospital, Taipei, Taiwan;2. School of Medicine, National Taiwan University College of Medicine, Taipei, Taiwan;3. Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, MA, USA;1. Charles Perkins Centre, University of Sydney, Australia;2. Exercise Health and Performance, Faculty of Health Sciences, University of Sydney, Australia;3. Charles Perkins Centre, Prevention Research Collaboration, Sydney School of Public Health, University of Sydney, Australia;4. Active Living and Public Health Program, Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, VIC, Australia;5. Department of Epidemiology and Public Health, Institute of Epidemiology and Healthcare, University College London, UK |
