A comparison between limited approach, ‘Off-pump-technique’ and conventional cardiopulmonary bypass. - Diegeler,A.; Doll,N.; Rauch,T.; Haberer,D.; Walther,T.; Falk,V.; Gummert,J.; Autschbach,R.; Mohr FW: The humoral immune response during coronary bypass,s.urgery. (Circulation, 2000)