1. Medical University of Innsbruck, Austria
2. OPZ Graz, Orthopaedic Private Clinic, Graz, Austria
3. Medical University of Graz, Graz, Austria
4. University of Music and Performing Arts Graz, Graz, Austria
5. Clinica Ortopedica e Traumatologica, Università di Verona, C.O.C. G.B. Rossi, Verona, Italy