2Filly RA. Obstetrical sonography: the best way to terrify a pregnant woman [J] . J Ultrasound Med, 2000, 19:1
3Fanrina A. Sekizawa A, Ralston SJ et al. Latent class analysis applied to patterns of fetal sonographic abnormalities: definition of phenotypes associated with aneuploidy [J] . Prenat Diagn. 1999, 19:840
4Mahmood R, Brierley CH, Faed MJW et al. Mechanisms of maternal aneuploidy: FISH analysis of oocytes and polar bodies in patients undergoing assisted conception [ J]. Hum Genet, 2000, 106:620 -626
5Melinda M, Ronald RR, McDonald P. ESHRE Reproduction and Soci- ety Task Force. Why do people postpone parenthood? Reasons and so- cial policy incentives [ J ]. Hum Reprod Update, 2011, 17 ( 6 ) : 848 - 860.
6Hsieh TT, Liou JD, Hsu J J, et al. Advanced rnatemal age and adverse perinatal outcomes in an Asian population [ J ]. European Journal of Obstetrics & Gynecology and Reproductive Biology, 2010,148 ( 1 ) : 21 - 26.
7Centers for Disease Control and Prevention. American society for re- productive medicine society for assisted reproductive technology. 2010 assisted reproductive technology: fertility clinic success rates report [ M/OL]. Atlanta(GA) : CDC ,2012 [ 2013 - 09 - 13]. http ://www. cdc. gov/art/ART2010/PDFs/ART_2010_Clinic_Report-Full, pdf.
8Menken J, Trussel J, Larsen U. Age and infertility [J]. Science, 1986, 233(4771 ) :1389 - 1394.
9Timofeev J, Reddy UM. Obstetric complications, neonatal morbidity, and indications for cesarean delivery by maternal age [ J ]. Obstet Gy- necol,2013,122(6) :1184 - 1195.
10Weng YH, Yang CY, Chiu YW. Risk assessment of adverse birth out- comes in relation to maternal age[J]. PLoS One,2014,9(12) :e114843.
