Sanjeev Nair, Anitha Abraham1, Reshmi Ramachandran2, Devi Mohan3, Raman Kutty V4
Department of Pulmonary Medicine and 3Community Medicine, Government Medical College, Thiruvananthapuram, 1Department of Community Medicine, Dr. SMCSI Medical College, Karakonam, 4Achutha Menon Centre for Health Science Studies, Thiruvananthapuram, 2Department of Community Medicine, Kolenchery Medical College, Ernakulam, Kerala, India