1. Saint Louis University Pulmonary and Critical Care Medicine, St. Louis, MO, USA
2. University of Kansas Pulmonary and Critical Care Medicine, Kansas City, MO, USA
3. Former Saint Louis University Pulmonary and Critical Care Medicine, St. Louis, MO, USA
4. Saint Louis University Division of Toxicology, St. Louis, MO, USA
5. Departments of Emergency Medicine and Pediatrics, University of Colorado School of Medicine, Aurora, CO, USA