1. From the Department of Genetics, Harvard Medical School, Boston, MA (G.G.R., C.N.T., J.G.S., C.E.S.)
2. Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford, United Kingdom (C.N.T.)
3. Cardiovascular Division, Brigham and Women’s Hospital, Boston, MA (C.N.T., C.E.S.)
4. Howard Hughes Medical Institute, Chevy Chase, MD (C.E.S.).