1. From the Cardiovascular Research Center, Massachusetts General Hospital, Boston (D.H., A.L., A.Y., L.X., D.J.M., I.J.D.)
2. Department of Biomedical Engineering, Boston University, MA (D.H.)
3. Experimental Cardiology, Utrecht University, The Netherlands (A.L.)
4. Harvard Medical School, Boston, MA (A.Y., I.J.D.)
5. iBET, Instituto de Biologia Experimental e Tecnológica, Oeiras, Portugal (C.C., M.S., P.M.A.)
6. Instituto de, Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras, Portugal (C.C., M.S., P.M.A.)
7. University Medical Center Groningen, University of Groningen, The Netherlands (J.D.K., P.v.d.M.)
8. Darisa, LLC, Saratoga, CA (A.G.)
9. Harvard Stem Cell Institute, Cambridge, MA (I.J.D.).