Raja, Vekash, Nayab Afzal, Naveen Roy, Javaid ur Rehman, and Besham Kumar Avinash. 2020. “Frequency of Vitamin D Deficiency Among Patients of Multiple Sclerosis in Pakistan”. Journal of Medical and Health Studies 1 (1): 17-22. https://al-kindipublishers.org/index.php/jmhs/article/view/755.