1. University of MD School of Medicine, University of Maryland, Baltimore, MA, USA
2. Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
3. Department of Medicine, University of Pittsburgh, Pittsburgh, PA, USA
4. Division of Medical Toxicology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
5. Department of Emergency Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA