Siddiqui, M. F. ., S. . Farooq, A. K. . Khan, and H. . Kausar. “Congenital Heart Disease: Causes and Risk Factors: Congenital Heart Disease: Causes and Risk Factors”. Pakistan BioMedical Journal, vol. 4, no. 1, June 2021, doi:10.52229/pbmj.v4i1.58.