1. Stanford University School of Medicine, Department of Emergency Medicine, Palo Alto, California
2. Harvard Medical School, Massachusetts General Hospital, Department of Emergency Medicine, Boston, Massachusetts
3. Thomas Jefferson University, Department of Emergency Medicine, Philadelphia, Pennsylvania
4. Harvard Medical School, Brigham and Women’s Hospital, Department of Emergency Medicine, Brigham and Women’s Hospital, Boston, Massachusetts
5. 123Sonography, Cohasset, Massachusetts
6. Newton Wellesley Hospital, Department of Emergency Medicine, Newton, Massachusetts