Reference:
Jairath V, Hearnshaw S, Brunskill SJ, Doree C, Hopewell S, Hyde C, Travis S, Murphy MF. Red cell transfusion for the management of upper gastrointestinal haemorrhage. The Cochrane Database of Systematic Reviews 2010; Issue 9. Art. No.: CD006613. DOI: 10.1002/14651858.CD006613.pub3.