1. Division of Gastroenterology and Hepatology Highland Hospital, Alameda Health System Oakland California USA
2. School of Medicine Central Michigan University Mt Pleasant Michigan USA
3. Tuberculosis Section, Division of Communicable Disease Control and Prevention Alameda County Public Health Department San Leandro California USA
4. Division of Gastroenterology and Hepatology Stanford University School of Medicine Stanford California USA
5. Gastroenterology and Hepatology Section Veterans Affairs Palo Alto Healthcare System Palo Alto California USA