Yassaee, F., R. Shekarriz-Foumani, and S. Sadeghi. “Amniocentesis Following Positive First Trimester Combined Screening: A Comparative Study”. Acta Medica Iranica, Vol. 57, no. 6, Nov. 2019, pp. 359-62, doi:10.18502/acta.v57i6.1879.