1. Department of Bioengineering, School of Engineering and Applied Science, University of California, Los Angeles, Los Angeles, California.
2. Division of Cardiology, Department of Medicine, University of California, Los Angeles, Los Angeles, California.
3. Department of Physiology, School of Medicine, University of California, Los Angeles, Los Angeles, California.
4. Greater Los Angeles VA Healthcare System, Los Angeles, California.
5. Department of Medical Engineering, California Institute of Technology, Pasadena, California.