The relationship between increment of nuchalsknfold thickness and chromosomally abnormal fetuses
SONG Guining, LIANG Meiying, WEI Yanqiu, XU Hong, ZHANG Lin, REN Meihong
Corrosion Science and Protetion Technology . 2011, (4): 265 -267 .  DOI: 10.3969/j.issn.1672-1861.2011.04.007