title: Reply to Fisher et al.
authors.affiliation: Institute for Anaesthesiology, Ruhr-University Bochum, Bad Oeynhausen, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Koster
authors.affiliation: Clinic for Thoracic and Cardiovascular Surgery, Heart and Diabetes Centre NRW, Ruhr-University Bochum, Bochum, Germany.
authors.forename: Jan F
authors.initials: JF
authors.lastname: Gummert
authors.affiliation: Institute for Anaesthesiology, Ruhr-University Bochum, Bad Oeynhausen, Germany.
authors.forename: Uwe
authors.initials: U
authors.lastname: Schirmer
authors.affiliation: Clinic for Thoracic and Cardiovascular Surgery, Heart and Diabetes Centre NRW, Ruhr-University Bochum, Bochum, Germany azittermann@hdz-nrw.de.
authors.forename: Armin
authors.initials: A
authors.lastname: Zittermann
keywords: Coronary artery bypass grafting; Outcome; Red blood cells; Transfusion