1 Bryan Heart, Division of MCS Therapy, Lincoln, NE, USA.
2 S. Orsola-Malpighi University Hospital, Heart Failure and Transplant Center, Bologna, Italy.
3 Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Austria; Division of Cardiac Surgery, Medical University of Vienna, Vienna, Austria; Ludwig-Boltzmann-Institute for Cardiovascular Research, Vienna, Austria.