1. The Royal London Hospital, Department
of Trauma and Orthopaedic Surgery, Barts Health
NHS Trust, Whitechapel Road, London
E1 1BB, UK.
2. Tohoku University School of Medicine, Department
of Orthopaedic Surgery, 1-1 Seiryo-machi, Aoba-ku, Sendai
980-8574, Japan.
3. The Royal National Orthopaedic Hospital, Brockley
Hill, Stanmore HA7 4LP, UK.