| Affiliation: | 1. Department of Microbiology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA;2. Pulmonary, Allergy and Critical Care Division, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA;3. Department of Surgery, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA;4. Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA;5. Penn Cardiovascular Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA |
