1. Division of Clinical Immunology and Allergy, Department of Medicine, University of Toronto, Toronto, ON, Canada
2. Office of the Director, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Morgantown, WV, USA
3. Department of Medicine, Division of Pulmonary Allergy and Critical Care Medicine, Jane and Leonard Korman Respiratory Institute, Thomas Jefferson University, Philadelphia, PA, USA
4. Canna Research Group, Boulder, CO, USA
5. University of Colorado School of Medicine, Aurora, CO, USA
6. Department of Medicine, Center for Translational Medicine and Division of Pulmonary Allergy and Critical Care Medicine, Jane and Leonard Korman Respiratory Institute, Thomas Jefferson University, Philadelphia, PA, USA