@incollection{Marttala13,
author = {Jaana Marttala},
title = {Prenatal Screening and Diagnosis},
booktitle = {Down Syndrome},
publisher = {IntechOpen},
address = {Rijeka},
year = {2013},
editor = {Subrata Kumar Dey},
chapter = {3},
doi = {10.5772/52861},
url = {https://doi.org/10.5772/52861}
}