1. Pulmonary Medicine, Safdarjung Hospital, New Delhi, India
2. Pulmonary medicine, Medipulse Hospital, Jodhpur, India
3. Community Medicine & Family Medicine, All India Institute of Medical Sciences, Jodhpur, India
4. Safdarjung Hospital, New Delhi, India
5. Department of Pulmonary, Critical Care and Sleep Medicine, VMMC and Safdarjung Hospital, New Delhi, India