1. Department of Emergency Medicine, Division of Medical Toxicology, University of Southern California, Los Angeles, CA, USA;
2. Department of Medical Toxicology, Banner-University Medical Center Phoenix, Phoenix, AZ, USA;
3. Department of Emergency Medicine, Univesity of Texas Southwestern Medical Center, Dallas, TX, USA;
4. Department of Emergency Medicine, UCSF Fresno Medical Center, Fresno, CA, USA