Firdaus, I., Kleiboer, A., Huizink, A. C., Mayza, A., Wiratman, W., & Edmi Edison, R. (2026). The Effectiveness of combined Cognitive Behavioural Therapy and Heart Rate Variability Biofeedback Compared to Treatment-As-Usual on Physiological Stress Reactivity and Resting-State Functional Connectivity in Methamphetamine Use Disorder Patients in Indonesia: Protocol for a Randomized Controlled Trial. PsychArchives. https://doi.org/10.23668/psycharchives.21622