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First-trimester screening for trisomy-21 using a simplified..:

Orlandi, Francesco ; Rossi, Cinzia ; Orlandi, Emanuela...
American Journal of Obstetrics and Gynecology.  192 (2005)  4 - p. 1107-1111 , 2005
Link: https://doi.org/10.1016/j.ajog.2004.11.036