1. From the BMEYE (B.E.W., I.G.), Amsterdam, The Netherlands; Physiology (N.W.), Institute for Cardiovascular Research-Vrije University, VU University Medical Center, Amsterdam, The Netherlands; Physiology (J.M.K.), Academic Medical Centre, University of Amsterdam, The Netherlands; and the Graduate School of Biomedical Engineering (A.A.), University of New South Wales, Sydney, Australia.