1. 1Department of Physiology; Pondicherry Institute of Medical Sciences, Puducherry-605014, India.
2. 2Department of Physiology; Sri Ramachandra Medical College and Research Institute, SRIHER, Porur, Chennai- 600116, India.
3. 3Department of Chest and TB; Sri Ramachandra Medical College and Research Institute, SRIHER, Porur, Chennai- 600116, India