1. Orthopedic Unit, Casa di Cura Santa Maria Maddalena Rovigo, 45030 Occhiobello, Italy
2. Department of Physiatry and Nursing, University of Zaragoza, 50009 Zaragoza, Spain
3. Italian College of General Practitioners and Primary Care, 50142 Florence, Italy
4. Center for Musculoskeletal Surgery Osnabrück (OZMC), Klinikum Osnabrück, 49076 Osnabrück, Germany
5. Department of Medical and Surgical Specialties and Dentistry, University of Campania “Luigi Vanvitelli”, 81100 Caserta, Italy
6. Department of Exercise Physiology and Sports Therapy, Institute of Sports Science, Justus-Liebig-University Giessen, 35390 Giessen, Germany
7. Primary Care Musculoskeletal Unit, Area V, Servicio de Salud del Principado de Asturias, SESPA, 33203 Gijón, Spain