3Macdonald R,Smith P,Vyas S.Cervical incompetence:the use of transvaginal sonography to provide an objective diagnosis.Ultrasound Obstet Gynecol,2001,18(3):211-6.
4Brook I,Feingold M,Schwart ZA,et al.Ultrasonography in the diagnosis of cervical incompetence in pregnancy:a new diagnosis approach.Br J Obstet Gynecol,1981,88(6):640-3.
5Podobnik M,Bulic M,Smiljanic N,et al.Ultrasonography in the detection of cervical incompetency.J Clin Ultrasound,1988,16(6):383-91.
6Iams JD,Paraskos J,Landon MB,et al.Cervical sonography in preterm labor.Obstel Bvnecol,1994,84(1):40-6.
5Yang C J, Stone P, Stewart AW. The epidemiology of recurrent miscarriage: a descriptive study of 1 214 prepregnant women with recurrent miscarriage. Aust NZ J Obstet Gynaecol, 2006, 46(4):316-22.
6Toth B, Jeschke U, Rogenhofer N, et al. Recurrent miscarriage: current concepts in diagnosis and treatment. J Reprod Immunol, 2010, 85(1):25-32.
7Sugiura-Ogasawara M, Furukawa TA, Nakano Y, et al. Depression as a potential causal factor in subsequent mis- carriage in recurrent spontaneous aborters. Hum Reprod, 2002, 17(10):2580-4.
8Gil-Villa AM, Cardona-Maya W, Agarwal A, et al. Assess- ment of sperm factors possibly involved in early recurrent pregnancy loss. Fertil Steril, 2010, 94(4): 1465-72.
9Miskovica S, Culica V, Konjevoda P, et al. Positive reproduc- tive family history for spontaneous abortion: predictor for recurrent miscarriage in young couples. Eur J Obstet Gynecol Reprod Biol, 2012, 161(1):182-6.
10Laurino MY, Bennett RL, Saraiy DS, et al. Genetic evaluation and counseling of couples with recurrent miscarriage: recom- mendations of the national society of genetic counselors. J Genet Counsel, 2005, 14(3): 165-81.