1. Shoulder and Elbow, Reconstructive Surgery Unit, Fundacion Jimenez Diaz-Capio, Avda Reyes Catolicos 2, 28040, Madrid, Spain.
2. Department of Orthopaedic Surgery, Mayo Clinic, 200 First Street, Southwest, Rochester, Minnesota 55905, USA.
3. Harvard University, 175 Cambridge Street, Su 400, Boston, Massachusetts 02114, USA.