Liengpongpun, P., and R. . Saipanish. “A study of clinical symptoms and severity of obsessive-compulsive disorder Patients at Ramathibodi Hospital during the COVID-19 pandemic”. Journal of the Psychiatric Association of Thailand, vol. 67, no. 2, June 2022, pp. 212-2, https://he01.tci-thaijo.org/index.php/JPAT/article/view/253897.