1. Centre for Health Sciences, School of Health Professions, Zurich University of Applied Sciences, Winterthur, Switzerland
2. Centre for Medical Research, QEII Medical Centre, University of Western Australia, Nedlands, WA, Australia
3. Department of Work and Organizational Psychology, Institute for Psychology, University of Berne, Berne, Switzerland
4. Department of Orthopaedic Surgery, Asklepios Klinikum Uckermark, Schwedt/Oder, Germany
5. Institute for Evaluative Research in Orthopaedic Surgery, MEM Research Center, University of Berne, Berne, Switzerland
6. Centre for Musculoskeletal Outcomes Research, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand