1 Division of Infectious Diseases, Johns Hopkins University, Baltimore, Maryland, USA.
2 Division of Communicable Disease Control, Center for Infectious Diseases, California Department of Public Health, Tuberculosis Control Branch, Richmond, California, USA.
3 Division of Pulmonary, Critical Care, and Sleep Medicine, University of Washington, Seattle, Washington, USA.
4 Pediatric Infectious Disease and Immunology, Levine Children's Hospital, Charlotte, North Carolina, USA.
5 Centers for Disease Control and Prevention, Atlanta, Georgia, USA.