1. St Mary’s Hospital, Praed Street, Paddington, London W2 1NY, UK.
2. Institute of Orthopaedics and Musculoskeletal Science, University College, London, Royal National Orthopaedic Hospital, Brockley Hill, Stanmore, Middlesex HA7 4LP, UK.
3. Shoulder Unit Hospital of St John and St Elizabeth, 60 Grove End Road, London NW8 9NH, UK.