Durland L. Telephone-Based, Clinician-Guided Self-Help Cognitive Behavioral Therapy for Depression in Parkinson’s Disease (dPD): The Responder Cases of "Alice" and "Carl," and the Nonresponder Cases of "Ethan" and "Gary". PCSP [Internet]. 2020 Jul. 26 [cited 2024 Dec. 3];16(1):1-103. Available from: https://pcsp.nationalregister.org/index.php/pcsp/article/view/2068