Affiliation: | a Department of Anesthesia Benedikt Kreutz Rehabilitation Center, Südring 15, D-7812, Bad Krozingen, FRG b Department of Cardiovascular Surgery Benedikt Kreutz Rehabilitation Center, Südring 15, D-7812, Bad Krozingen, FRG c Benedikt Kreutz Rehabilitation Center, Südring 15, D-7812, Bad Krozingen, FRG d IMMUNO GmbH, D-6900, Heidelberg, FRG |