Singh, Gurmeet, Gursharn Singh, Harnoorjit Kaur Brar, and Supriya Malik. “Vitamin D Levels in Preterm and Term Neonates at Birth”. International Journal of Contemporary Pediatrics 4, no. 1 (December 21, 2016): 48–52. Accessed February 28, 2026. https://www.ijpediatrics.com/index.php/ijcp/article/view/80.