1. East of Scotland Blood Transfusion Service, Ninewells Hospital, Dundee DD1 9SY, UK.
2. North of Scotland Blood Transfusion Service, Raigmore Hospital, Perth Road, Inverness IV2 3UJ, UK.
3. Princess Margaret Rose Orthopaedic Hospital, 41-43 Frogston Road West, Edinburgh EH10 7ED, UK.