8Morin L,Van den Hof MC. Society of Obstetricians and Gynaecologists of Canada.SOGC clinical practice guidelines.Ultrasound evaluation of first trimester pregnancy complications.Number 161,June 2005[J].International Journal of Gynecology and Obstetrics,2006,(01):77-81.
9Schouwink MH,Fong BF,Mol BW. Ultrasonographic criteria for non-viability of first trimester intra-uterine pregnancy[J].Early Pregnancy,2000,(03):203-213.
10Levi CS,Lyons EA,Lindsay DJ. Early diagnosis of nonviable pregnancy with endovaginal US[J].Radiology,1988,(02):383-385.
9Fong KW, Ghai S, Toi A, et al. Prenatal ultrasound findings of lissencephaly associated with Miller-Dicker syndrome and comparison with pre- and postnatal magnetic resonance imaging.Ultrasound Obstet Gynecol, 2004,24 : 716-723.
10Guibaud L, Attia-Sobol J, Buenerd A, et al. Focal sonographic periventricular pattern associated with mild ventriculomegaly in fetal cytomegalic infection revealing cytomegalic encephalitis in the third trimester of pregnancy. Prenat Diagn, 2004, 24: 727-732.