Rakesh P S, Retheesh Rahul, Chandran Rangeen, Sadiq A, Ranjitha S
Centre for Public Health Protection, Kollam, Kerala, India.
Department of Community Medicine, Travancore Medical College, Kollam, Kerala, India.
Indian J Med Res. 2017 Sep;146(3):426-429. doi: 10.4103/ijmr.IJMR_275_16.