1. RESIST-TB, Partners In Health, Boston, MA, USA
2. Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA
3. Department of Epidemiology, Yale University, New Haven, CT, USA
4. RESIST-TB, Department of Global Health & Social Medicine, Harvard University, Boston, MA, USA
5. RESIST-TB, Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA; Department of Medicine, Boston University School of Medicine, Boston, MA, USA. rhorsbu@bu.edu