Persistence in the Methadone Maintenance Program and Its Relationship with the Medication Regimen Complexity Index in Opioid-Dependent Patients. - Álvaro-Alonso, Elena Alba; Gómez-Álvarez, María del Carmen; Segovia-Tapiador, Beatriz; Del-Pino-Illaconza, María Isabel; Valencia, Jorge; Ryan, Pablo; Aguilar-Ros, Antonio; Escobar-Rodríguez, Ismael (Pharmaceuticals (14248247), 2024)