2Siriratmanawong N,Fucharoen G,Sanchaisuriya K,et al.Simultaneous PCR detection of beta-thalassemia and alpha-thalassemia 1 (SEA type) in prenatal diagnosis of complex thalassemia syndrome[J].Clin Biochem,2001,34(5) :377 ～ 380.
3Lo YMD,Corbetta N,Chamberlain PF,et al.Presence of fetal DNA in maternal plasma and serum[J].Lancet,1997,350(9 076) :485 ～ 487.
4Lo YMD,Leung TN,Tein MSC,et al.Quantitative abnormalities of fetal DNA in maternal serum in preeclampsia[J].Clin Chem,1999,45(2):184～ 188.
5Lee T,Leshane T,Messerlian GM,et al.Down syndrome and cell-free fetal DNA in archived maternal serum[J].Am J Obstet Gynecol,2002,187(5):1217～1221.
6Hoesli I,Danek,Lin D,et al.Circulating erythroblasts in maternal blood are not elevted before onset of preterm labor[J].Obstetrics Gynecology,2002,100(5):992～996.
7Leung TN,Zhang Y,Lan TK,et al.Maternal plasma fetal DNA as a marker for preterm labor[J].Lancet,1998,352(9 114):1 904 ～ 1 905.
8Van WIJ,De HAC,Jurhawan R,et al.Detection of apoptotic fetal cells in plasma of pregnant women[J].Clin Chem,2000,46(5) :729 ～ 731.
9Birch L,English CA,O'Donoghue K,et al.Accurate and robust quantification of circulating fetal and total DNA in maternal plasma from 5 to 41 weeks of gestation [J].Clin Chem,2005,51 (2):312 ～ 320.
10Lo YMD,Tein MSC,Lau TK,et al.Quantitative analysis of fetal DNA in maternal plasma and serum:implieations for noninvasive prenatal diagnosis [J].Am J Hum Genet,1998,62(4) :768 ～ 775.
