1. University of Brescia - IRCCS Fondazione Don Gnocchi Milan; Physical and Rehabilitation Medicine; Viale Europa Brescia Italy 25121
2. Lazio Regional Health Service; Department of Epidemiology; Via di Santa Costanza, 53 Rome Italy 00198
3. University of Teesside; School of Health and Social Care; Victoria Road Middlesbrough Cleveland UK TS13BA
4. Staffordshire University; Faculty of Health; Leek Road Stoke-on-Trent UK ST4 2DF
5. "Tzanio" General Hospital of Piraeus; Department of Trauma and Orthopaedics; Piraeus Attica Greece 18536
6. University of Medical Sciences; Department of Pediatric Orthopedics and Traumatology; ul. 28 Czerwca 1956 nr 135 Poznan Poland 61-545
7. Saitama Medical University; Department of Orthopaedic Surgery; 1981 Kamoda Kawagoe Saitama Japan 350-8550
8. ISICO (Italian Scientific Spine Institute); Via Roberto Bellarmino 13/1 Milan Italy 20141