Postoperative infection and natural killer cell function following blood transfusion in patients undergoing elective colorectal surgery - Jensen,L.S.; Andersen,A.J.; Christiansen,P.M.; Hokland,P.; Juhl,C.O.; Madsen,G.; Mortensen,J.; Møller-Nielsen,C.; Hanberg Søorensen,F.; Hokland,M. (Br J Surg, 1992)