Binkert, Franz, Albert Schinzel, and Michael Mutter. “Impact of Prenatal Diganosis on the Prevalence of Live Births With Down Sysndrome in the Eastern Half of Switzerland 1980-1996”. Swiss Medical Weekly 132, no. 3334 (August 24, 2002): 478–484. Accessed April 23, 2024. https://smw.ch/index.php/smw/article/view/205.