Fatemeh Moqbeli, Fateme Mohebi Rezaei, Elnaz Seyyedbaglou, Parisa Fatahi, Javad Adeldoust, Mohammad Amin Roustaei Hossein Abad. Effectiveness of Acceptance and Commitment Therapy on Pain Catastrophizing, Pain Self-Efficacy, and Psychological Flexibility in Individuals with Chronic Pain: A Quasi-Experimental Study. HN. Published online May 4, 2026. doi:10.61838/