[1] Univ Penn, Perelman Sch Med, Dept Emergency Med, 3400 Spruce St,Ground Floor, Philadelphia, PA 19104 USA
[2] Yale New Haven Hlth Syst, Dept Emergency Med, 20 York St, New Haven, CT 06510 USA
[3] Mt Sinai Hlth Syst, Dept Emergency Med, 555 W 57th St, New York, NY 10019 USA
[4] Univ Penn, Perelman Sch Med, Div Gen Internal Med, Dept Med, 3400 Spruce St, Philadelphia, PA 19104 USA