3Phupong V,Hanprasertpong T.Combined maternal serum inhibin A and embryonic/fetal heart rate for the prediction of pregnancy outcome in a first-trimester threatened abortion. Journal of the Medical Association of Thailand . 2011
4Agnesi R,Valentini F,Fedeli U,et.al.Maternal exposures and risk of spontaneous abortion before and after a community oriented health education campaign. European Journal of Public Health . 2011
5Chauleur C,Galanaud JP,Alonso S,et al.Observational study of pregnant women with a previous spontaneous abortion before the10th gestation week with and without antiphospholipid antibodies. Journal of Thrombosis and Haemostasis . 2010
3Tuzovic L, Djelmis J, Ilijic M. Obstetric risk factors associate with placenta previa development:case control study [ J ]. Croat J, 2003,44:728-733.
4Johnson LG, Mueller BA, Daling JR. The relationship of placeta previa and history of induced abortion [ J ]. Int J Gynaecol Obstet, 2003,81:191-198.
5Faiz AS, Ananth CV. Etiology and risk factors for placenta previa: an overview and meta analysis of observational studies [ J ]. Matem Fatel Neonatal Med, 2003, 13 : 175-190.
6Gilliam M, Rosenberg D, Davis F. The likelihood of placenta previa with greater number of cesare and elireries and higher parity [ J]. Obstet Gynecol,2002 ,99 :976-950.
8Resseguie LJ, Hick JF, Bruen JA , et al. Congenital malformations among offspring exposed in utero to progestins, Olmsted County, Minnesota, 1936 - 1974[ J]. Fertil Steril, 1985,43(4) : 514 - 519.
9Carmichael SL , Shaw GM , Lament C , et al . Maternal progestin intake and risk of hypospadias [ J ] . Archives of Pediatrics & Adolescent Medicine,2005,159(10) :957 - 962.
10Kalinka J, Radwan M. The impact of dydrogesterone supplementation on serum cytokine profile in women with threatened abortion[J]. American Journal of Reproductive I mmunology,2006,55(2): 115- 121.