1. Hip Department (CAD) Gaetano Pini, CTO Orthopedic Institute, University of Milan, Italy
2. Interbalkan European Medical Centre, Thessaloniki Hygeia Hospital, Athens, Greece
3. Department of Life Health & Environmental Sciences, Unit of Orthopedics and Traumatology, University of L’Aquila, L’Aquila, Italy
4. Department of Trauma Surgery, IRCCS Orthopaedic Institute R. Galeazzi, University of Milan, Milan, Italy
5. Faculty of Medicine, University of Bern, Bern, Switzerland