Andrew B Sparks

Noninvasive prenatal detection and selective analysis of cell-free DNA obtained from maternal blood: evaluation for trisomy 21 and trisomy 18.

Arnold Oliphant, A. Oliphant, C. Struble, 2012, American journal of obstetrics and gynecology.

Non-Invasive Chromosomal Evaluation (NICE) Study: results of a multicenter prospective cohort study for detection of fetal trisomy 21 and trisomy 18.

Hanmin Lee, Aaron B Caughey, Dick Oepkes, 2012, American journal of obstetrics and gynecology.