1. Rajan Babu Institute of Pulmonary Medicine and Tuberculosis, Respiratory disease and Tuberculosis, New Delhi, Delhi, India
2. Department of Pulmonary Medicine, All India Institute of Medical Sciences, Jodhpur, Rajasthan, India
3. Department of Community medicine, Government Medical College, Sri Gangapur, India
4. New Delhi Tuberculosis Centre, Tuberculosis Control Centre, New Delhi, Delhi, India