Hairul Izwan Abdul Rahman, et al. “IMPACT OF METHADONE MAINTENANCE THERAPY ON HIV INCIDENCE IN PERAK, 2008 - 2017: A COX REGRESSION ANALYSIS”. Malaysian Journal of Public Health Medicine, vol. 19, no. 1, Jan. 2019, pp. 75-83, doi:10.37268/mjphm/vol.19/no.1/art.39.