Qurat-ul-Ain Aslam,Saima Akhtar,Muhammad Hafeez, Shahzadi Sumbal Ghazi,Samina Yaqoob,Uzma Abid , Q.- ul-A. A. A. H. S. S. G. Y. A. . “Association Between Vitamin D Deficiency and Asthma in Childhood”. Journal of Rawalpindi Medical College, vol. 23, no. 4, Dec. 2019, http://journalrmc.com/index.php/JRMC/article/view/1304.