El-Kassas, G. M., M. A. El Wakeel, M. A. Elabd, A. H. Kamhawy, M. A. Atti, S. A. Abd El-Gaffar, S. K. Hanafy, and E. Awadallah. “Vitamin D Status in Neonatal Pulmonary Infections: Relationship to Inflammatory Indicators”. Open Access Macedonian Journal of Medical Sciences, vol. 7, no. 23, Dec. 2019, pp. 3970-4, doi:10.3889/oamjms.2019.592.