1. Sunderland Royal Hospital, Kayll Road, Sunderland SR4 7TP, UK.
2. Kingston Hospital, Galsworthy Road, Kingston Upon Thames, Surrey KT2 7QB, UK.
3. Peterborough City Hospital, Bretton Gate, Peterborough PE3 9GZ, UK.
4. Royal National Orthopaedic Hospital, Brockley Hill, Stanmore, Middlesex HA7 4LP, UK.
5. North Sydney Orthopaedic and Sports Medicine Centre, Gillies Street, Wollstonecraft, New South Wales 2065, Australia.