1 Department of Health Systems and Population Health Sciences, Tillman J Fertitta Family College of Medicine, University of Houston, Houston, TX, USA.
2 Department of Emergency Medicine, University of Virginia School of Medicine, Charlottesville, VA, USA. Electronic address: WB4Z@hscmail.mcc.virginia.edu.
3 Department of Emergency Medicine, Rush University Medical Center, Chicago, IL, USA.
4 Madigan Army Medical Center, Joint Base Lewis-McChord, WA 98431, USA.
5 Divisions of Emergency Medicine and Infectious Diseases, Washington University School of Medicine, 660 S. Euclid Ave, St. Louis, MO, USA. Electronic address: syliang@wustl.edu.
6 The University of Texas Southwestern Medical Center, Department of Emergency Medicine, 5323 Harry Hines Boulevard, Dallas, TX, USA.
7 Department of Emergency Medicine, Brooke Army Medical Center, Fort Sam Houston, TX, USA. Electronic address: Brit.long@yahoo.com.