1. From Ariadne Labs at Brigham and Women’s Hospital and Harvard T.H. Chan School of Public Health (E.G., A.A.G.), Boston; the Departments of Emergency Medicine (E.G.) and Surgery (A.A.G.), Brigham and Women’s Hospital and Harvard Medical School, Boston; and CIC Health, Cambridge (E.G., C.K., A.A.G.) — all in Massachusetts.