1. Hand and Upper Limb Surgery, Institut Kaplan, Barcelona, Spain
2. Royal Perth Hospital, Fremantle Hand Unit, Sir Charles Gairdner Hospital, Perth, Western Australia, Australia
3. Department of Clinical Science and Education, Karolinska Instituten, Stockholm, Sweden
4. Musculoskeletal & Sports Injury Epidemiology Center, Sophiahemmet University, Stockholm, Sweden
5. Pulvertaft Hand Centre, Royal Derby Hospital, Derby, UK
6. Mayo Clinic, Rochester, MN, USA