1. International Union Against Tuberculosis and Lung Disease, South-East Asia Regional Office, New Delhi, India
2. World Health Organization Country Office for India, New Delhi, India
3. Institute of Public Health, University of Southern Denmark, Copenhagen, Denmark; and EpiData Association, Odense, Denmark
4. International Union Against Tuberculosis and Lung Disease, Paris, France; and Institute of Social and Preventive Medicine, University of Zurich, Switzerland