Professor Yacoub's practice of using fresh warm blood continued and remained an issue, and did so until he retired in 2001. Linked evidence NHBT0101360 - Email from Marcela Contreras to Peter Garwood Stuart Penny Julia Earley Martin Haines and Alison Kruse - 18 Mar 1999 Chronology Information Date: 1 January 1999 Chapter/issue Blood Transfusion: Clinical Practice