1 Frankel Cardiovascular Center and Institute for Healthcare Policy and Innovation, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI. Electronic address: gbarnes@umich.edu.
2 Center for Vascular Emergencies, Department of Emergency Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA.
3 Department of Emergency Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL.
4 Division of Pulmonary Critical Care and Sleep Medicine, St. Louis University School of Medicine, St. Louis, MO.
5 Division of Cardiology, Lancaster General Health, University of Pennsylvania Medicine, Lancaster, PA.
6 Division of Hematology and Oncology, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA.
7 Division of Cardiology, Section of Vascular Medicine, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA.
8 Penn Cardiovascular Outcomes, Quality and Evaluative Research Center, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA.