Verloes, A., Gillerot, Y., Van Maldergem, L., Schoos, R., Herens, C., Jamar, M., Dideberg, V., Lesenfants, S., & Koulischer, L. (January 2001). Major Decrease in the Incidence of Trisomy 21 at Birth in South Belgium: Mass Impact of Triple Test?
European Journal of Human Genetics, 9 (1), 1-4. doi:10.1038/sj.ejhg.5200575
https://hdl.handle.net/2268/83972