1. Clinic for Orthopaedic & Trauma Surgery, University of Heidelberg, Schlierbacher Landstrasse 200a, 69118 Heidelberg, Germany.
2. Massachusetts General Hospital, Harvard Shoulder Service, YAW-3-3G, 32 Fruit Street, Boston, Massachusetts 02114, USA.
3. Toyonaka Municipal Hospital, 4-14-1 Shibaharacho, Toyonakashi, Osaka 560-0055, Japan.
4. Casa di Cura "Policlinico Città di Quartu, via Silesu 10, Quartu Sant'Elena, Cagliari, Italy.
5. Centre Orthopedique Santy, 24 Avenue Paul Santy, 69008 Lyon, France.