Nambiar, M. K., R. P. S., N. C., and P. Kumar. “Downs Syndrome and Its Screening: How Aware Are We?”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 7, no. 3, Feb. 2018, pp. 1186-90, doi:10.18203/2320-1770.ijrcog20180915.