1 Tuberculosis Section, Division of Communicable Disease Control and Prevention, Alameda County Public Health Department, San Leandro, California, USA.
2 Division of Pediatric Infectious Diseases, University of California, San Francisco, San Francisco, California, USA.
3 Center for Tuberculosis, University of California, San Francisco, San Francisco, California, USA.
4 Hepatitis B Foundation, Doylestown, Pennsylvania, USA.
5 Division of Gastroenterology and Hepatology, Veterans Affairs Palo Alto Healthcare System, Palo Alto, California, USA.
6 Division of Gastroenterology and Hepatology, Stanford University School of Medicine, Stanford, California, USA.