Thomas, J., N. A. Kumar, D. Manoharan, S. Cynthia, S. S. Prabu, and N. A. Ahmed. “A Study of Comorbid Conditions in Psoriasis”. Journal of Pakistan Association of Dermatologists, vol. 19, no. 4, Dec. 2016, pp. 200-2, https://www.jpad.com.pk/index.php/jpad/article/view/544.