Kosari Esfahani, L., Fallahi, F., Khodagholipour, N., Alizadeh Kondori, S., & Saghiha, H. "The effectiveness of mindfulness-based cognitive therapy (MBCT) on sleep quality and happiness in patients with chronic pain", Medical Journal of Mashhad university of Medical Sciences, 62, 6, 2020, 1971-1980. doi: 10.22038/mjms.2020.17329