1. From the Brigham and Women’s Hospital Heart and Vascular Center and Harvard Medical School, Boston (D.L.B.); the Department of Emergency Medicine, Thomas Jefferson University, Philadelphia (C.V.P.); McMaster University and the Thrombosis and Atherosclerosis Research Institute, Hamilton, ON, Canada (J.I.W.); CirQuest Labs and the University of Tennessee Health Science Center, Memphis (L.K.J.); and PhaseBio Pharmaceuticals, Malvern, PA (S.X., S.E.A., B.R.U., M.C.M., J.S.L.).