1. Department of Orthopaedic Surgery, Shoulder
and Elbow Surgery Unit, Fundación Jiménez
Díaz, Avda Reyes Católicos, 2, Madrid 28040, Spain.
2. University Hospitals Coventry and Warwickshire, Clifford
Bridge Road, Coventry, West
Midlands CV2 2DX, UK.
3. Hopital Vall d´Hebron, Passeig
Vall d’Hebron, 119 to 129, 08035 Barcelona, Spain.
4. Mayo Clinic, 200
First St. SW, Rochester Minnesota 55905, USA.