Zaman, Saeed, Umama Ahmed, Sajid Ali Shah, Misbah Munir, Sadaf Nawaz, and Lutfullah Goheer. “Comparison of Vitamin D Levels in Children With Recurrent Respiratory Tract Infections With Normal Children”. Pakistan Armed Forces Medical Journal 72, no. 2 (April 28, 2022): 353–56. Accessed September 15, 2024. https://www.pafmj.org/PAFMJ/article/view/7649.