1. Department of Pulmonary Medicine, Indira Gandhi Medical College, Shimla, Himachal Pradesh, India.
2. Department of Cardiology, Indira Gandhi Medical College, Shimla, Himachal Pradesh, India.
3. Department of Medical and Pediatric Oncology, GCRI, Ahmedabad, Gujarat, India.
4. Indira Gandhi Medical College, Shimla, Himachal Pradesh, India.