1. International Blood Group Reference Laboratory; NHS Blood and Transplant; Bristol; UK
2. North of Scotland Blood Transfusion Centre; Raigmore Hospital; Inverness; UK
3. Red Cell Immunohaematology; NHS Blood and Transplant; Bristol; UK
4. Blood Transfusion; Cheltenham General Hospital; Cheltenham; UK
5. Red Cell Immunohaematology; NHS Blood and Transplant; London; UK