1. Division of Pediatric Infectious Diseases; Department of Pediatrics; Duke University Medical Center; Durham NC USA
2. Duke Macromolecular Crystallography Center; Duke University Medical Center; Durham NC USA
3. Department of Dermatology and Venereology; The Second Hospital of Shanxi Medical University; Taiyuan Shanxi China
4. Department of Molecular Genetics and Microbiology; Duke University Medical Center; Durham NC USA