Arbab, Khushbakht, Hafsa Majid, Lena Jafri, Aysha Habib Khan, and Madiha Hashmi. 2020. “VITAMIN D DEFICIENCY IN CRITICALLY ILL PATIENTS: A SINGLE CENTER CROSS-SECTIONAL STUDY”. Pakistan Armed Forces Medical Journal 70 (3):765-69. https://pafmj.org/PAFMJ/article/view/4657.