“The Effect of Patients’ Characteristics and the Dosage of Methadone Maintenance on Retention of Methadone Therapy in H. Adam Malik General Hospital, Medan”. Indonesian Journal of Medicine 4, no. 2 (March 10, 2019): 176–182. Accessed October 25, 2026. https://www.theijmed.com/index.php/theijmed/article/view/190.