1. Lund University, Faculty of Medicine, Department of Clinical Sciences Lund, Orthopaedics, Clinical Epidemiology Unit, Lund, Sweden
2. Research Centre for Health Services Management, Institute for Futures Studies in Health, Kerman University of Medical Sciences, Kerman, Iran
3. Astra Zeneca R&D, Gothenburg, Sweden
4. Research Unit for Musculoskeletal Function and Physiotherapy, University of Southern Denmark, Odense, Denmark
5. Department of Orthopaedics and Traumatology, University of Southern Denmark, Odense, Denmark
6. Clinical Epidemiology Research and Training Unit, Boston University School of Medicine, Boston, MA, USA