1. From the Stanford Cardiovascular Institute (P.G., R.S., J.C.W.)
2. Department of Medicine, Division of Cardiology (P.G., R.S., J.C.W.)
3. Institute for Stem Cell Biology and Regenerative Medicine (P.G., R.S., J.C.W.)
4. Stanford University School of Medicine, CA; Department of Physiology, University of California San Francisco (V.G.)
5. Division of Cardiovascular Medicine, University of Utah, Salt Lake City (M.C.S.)
6. Department of Medicine, University of Wisconsin-Madison (T.J.K.).