Katoch, G., S. Sharma, M. Sharma, A. Gunjiganvi, and A. Singhal. “Association of Infant and Maternal Serum 25-Hydroxy Vitamin D Levels With Severity of Pneumonia in Infants”. International Journal of Contemporary Pediatrics, vol. 3, no. 4, Dec. 2016, pp. 1256-61, doi:10.18203/2349-3291.ijcp20163655.