1. Department of Pediatrics, Division of Adolescent and Young Adult Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States
2. Division of Infectious Diseases, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States
3. Department of Biology, School of Computer, Mathematical and Natural Sciences, Morgan State University, Baltimore, Maryland, United States
4. Department of Medicine, Division of Infectious Diseases, Johns Hopkins University School of Medicine, Baltimore, Maryland, United States