1. Department of Emergency Medicine, Division of Clinical Toxicology, VCU Medical Center, Richmond, VA, USA;
2. Virginia Poison Center, Richmond, VA, USA;
3. Department of Emergency Medicine, VCU Medical Center, Richmond, VA, USA;
4. Department of Emergency Medicine, Eastern Virginia Medical School, Norfolk, VA, USA;
5. Department of Biostatistics, Virginia Commonwealth University, Richmond, VA, USA;
6. Division of Medical Toxicology, University of Virginia, Charlottesville, VA, USA