Dissanayake, Theruwani N., and Chitlada Areesantichai. 2018. “Patterns of Heroin Use and Risk Behaviors Among Prisoners, Colombo, Sri Lanka”. Journal of Health Research 31 (Suppl. 2):S163-169. https://he01.tci-thaijo.org/index.php/jhealthres/article/view/114534.