1. First Orthopaedic Department, “Georgios Papanikolaou” Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
2. Shoulder Institute, ATOS Orthoparc Klinik, Cologne, Germany
3. Department of Orthopaedic Surgery, Buenos Aires British Hospital, Buenos Aires, Argentina
4. Special sports surgery department, St. Josef Krankenhaus, Wuppertal, Germany