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Screening for fetal trisomy 21 in gestational weeks 6 and 7.
Madsen HN, Petersen OB, Tørring N. Madsen HN, et al. Among authors: petersen ob. Acta Obstet Gynecol Scand. 2010 Sep;89(9):1218-21. doi: 10.3109/00016349.2010.489600. Acta Obstet Gynecol Scand. 2010. PMID: 20521874 Free article.
168 results