1 Department of Medicine, University of Washington, Seattle, WA.
2 Section of Electrophysiology, Division of Cardiology, University of Washington, Seattle, WA.
3 Department of Emergency Medicine, University of Washington, Seattle, WA; Division of Pulmonary Critical Care and Sleep Medicine, University of Washington, Seattle, WA.
4 Department of Emergency Medicine, University of Colorado, Aurora, CO; Washington Poison Center, Seattle, WA.