1. Departments of Bioengineering and Applied Physics, Stanford University, Stanford, CA 94305, USA.
2. Howard Hughes Medical Institute, Stanford, CA 94305, USA.
3. Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA.
4. Department of Pediatrics (Cardiology), Stanford University and the Stanford Cardiovascular Research Institute, Stanford, CA 94305, USA.
5. Office of Heart Transplant Services, Kaiser Permanente Northern California, Santa Clara Medical Center, Santa Clara, CA 95051, USA.