Affiliation: | (1) Institut für Fluiddynamik, Swiss Federal Institute of Technology, CH-8092 Zurich;(2) Present address: Sulzer Brothers Limited, CH-8401 Winterthur;(3) Department of Internal Medicine, University Hospital, CH-8091 Zurich;(4) Institut für Fluiddynamik, Swiss Federal Institute of Technology, CH-8092 Zurich |