Mallick, Yousuf Abd, and Ahsun Jiwani. 2022. “Vitamin D Deficiency and Associated Clinical Co-Factors in Patients With Early and Late-Onset Plaque Psoriasis”. Journal of Pakistan Association of Dermatologists 31 (4):614-22. https://www.jpad.com.pk/index.php/jpad/article/view/1663.