1. Biological Sciences, University of Pittsburgh , Pittsburgh, Pennsylvania , USA
2. Division of Pulmonary and Critical Care Medicine, Johns Hopkins University School of Medicine , Baltimore, Maryland , USA
3. Division of Clinical Pharmacology, Johns Hopkins University School of Medicine , Baltimore, Maryland , USA
4. Division of Infectious Diseases, Johns Hopkins University School of Medicine , Baltimore, Maryland , USA
5. Department of Radiology, Johns Hopkins University School of Medicine , Baltimore, Maryland , USA