1. Department of Orthopaedic Surgery, School of Medicine, University of Ioannina, 451 10 Ioannina, Greece
2. Department of Physical Medicine and Rehabilitation, School of Medicine, University Hospital of Ioannina, 451 10 Ioannina, Greece
3. Arthroscopy & Orthopaedic Surgery Department, Metropolitan Hospital, Neo Faliro, 185 47 Pireas, Greece