1. The Reading Shoulder Unit, Swallows
Croft, Wensley Road, Coley
Park, Reading RG1 6UZ, UK.
2. Southwest London Elective Orthopaedic
Centre, Denbies Wing, Epsom
General Hospital, Dorking Road, Epsom
KT18 7EG, UK.
3. University of Cambridge, Centre
for Applied Medical Statistics, Department
of Public Health and Primary Care, Institute
of Public Health, Forvie Site, Robinson
Way, Cambridge CB2 0SR, UK.