1. Division of Pulmonary, Critical Care Medicine, Allergy, and Clinical Immunology;The David Geffen School of Medicine at UCLA, Los Angeles, CA
2. The Division of Infectious Diseases, Department of Medicine, Stritch School of Medicine, Loyola University Chicago, Maywood, IL
3. Department of Medical Microbiology/Infectious Diseases, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada