Surenthirakumaran, R.; Sasrubi, S.; Sasitharan, Shayuthan(Department of Community and Family Medicine, Faculty of Medicine, University of Jaffna Sri Lanka, 2020)
Kumaran, S.; Surenthirakumaran, R.; Coonghe, P. A. D.; Sivarajah, N.(Department of Community and Family Medicine, University of Jaffna, Sri Lanka., 2017)