Ullerithody, Kasim Resivi, Rajalakshmi Harihara Iyer, and Kinattinkara Ramachandran Subharaman. “Vitamin D Deficiency in Children With Asthma”. International Journal of Contemporary Pediatrics 7, no. 10 (September 21, 2020): 2030–2036. Accessed October 25, 2025. https://www.ijpediatrics.com/index.php/ijcp/article/view/3615.