“Self-Efficacy, Effort and Control Expectancy in the Antirretroviral Treatment Adherence in Methadone Maintenance Patients Autoeficacia, Esfuerzo Y Expectativas De Control En La adhesión Al Tratamiento Antirretroviral En Pacientes VIH+ (. )”. Health and Addictions/Salud y Drogas 8, no. 1 (November 12, 2008). Accessed August 15, 2026. https://ojs.haaj.org/haaj/article/view/68.