1. Electrical Engineering Department, University of Virginia, Charlottesville, Virginia,
2. Mechanical, Aerospace, and Nuclear Engineering Department, University of Virginia, Charlottesville, Virginia,
3. Department of Biomedical Engineering, University of Virginia, Charlottesville, Virginia,
4. Artificial Heart Laboratory, University of Utah, Salt Lake City, Utah, U.S.A.,
5. Medquest Products, Inc., Salt Lake City, Utah, U.S.A.