Mohammadifard, M., N. Khorashadizadeh, and M. Zarouni. “Detection Rate of Fetal CNS Anomalies by First and Second Trimester Ultrasound Screening”. Journal of Contemporary Medical Sciences, vol. 7, no. 3, June 2021, pp. 164-6, doi:10.22317/jcms.v7i3.982.