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.