Guidelines on red cell transfusion in sickle cell disease. Part I: principles and laboratory aspects.

Whittington Health, London Barts Health NHS Trust & NHS Blood and Transplant, London Oxford University Hospitals NHS Foundation Trust, Oxford University College London Hospitals NHS Foundation Trust, London Sandwell and West Birmingham Hospitals NHS Trust, Birmingham NHS Blood and Transplant, London NHS Blood and Transplant, London CENTRAL MANCHESTER UNIVERSITY HOSPITALS NHS FOUNDATION TRUST, MANCHESTER