| [1] | 
																						 
											  Buckett WM, Chain RC, Dean NL, et al. Pregnancy loss in pregnancies conceived after in vitro oocyte maturation, conventional in vitro fertilization, and intracytoplasmic sperm injection [J]. Fertil Steril, 2008, 90(3): 546-550. 
											 											 | 
										
																													
																						| [2] | 
																						 
											  Warda H, Mamik MM, Ashraf M, et al. Interstitial ectopic pregnancy: conservative surgical management [J]. JSLS, 2014, 18(2): 197-203. 
											 											 | 
										
																													
																						| [3] | 
																						 
											  Braude P, Rowell P. Assisted conception III-problems with assisted conception [J]. Br Med J, 2003, 327(7420): 920-927. 
											 											 | 
										
																													
																						| [4] | 
																						 
											  Schieve LA, Peterson HB, Meikle SF. Live birth rates and multiple birth risk using in vitro fertilization [J]. JAMA, 2007, 282(19): 1832-1837. 
											 											 | 
										
																													
																						| [5] | 
																						 
											  Qin J, Liu X, Sheng X, et al. Assisted reproductive technology and the risk of pregnancy-related complications and adverse pregnancy outcomes in singleton pregnancies: a meta-analysis of cohort studies [J]. Fertil Steril, 2016, 105(1): 73-85. 
											 											 | 
										
																													
																						| [6] | 
																						 
											  Wang ET, Kathiresan ASQ, Bresee C, et al. Abnormal implantation after fresh and frozen in vitro fertilization cycles [J]. Fertil Steril, 2017, 107(5): 1153-1158. 
											 											 | 
										
																													
																						| [7] | 
																						 
											  Sherry LF, Laura AS, Denise JJ. Pregnancy loss among pregnancies conceived through assisted reproductive technology, United States, 1999-2002 [J]. Am Epidemiol. 2007, 165(12):1380-1388. 
											 											 | 
										
																													
																						| [8] | 
																						 
											  Potdar N, Gelbaya TA, Konje JC, et al. Adjunct low molecular weight heparin to improve live birth rate after recurrent implantation failure: a systematic review and meta-analysis [J]. Hum Reprod Update, 2013, 19(6): 674-684. 
											 											 | 
										
																													
																						| [9] | 
																						 
											  Grady R, Alavi N, Vale R, et al. Elective single embryo transfer and perinatal outcomes: a systematic review and meta-analysis [J]. Fertil Steril, 2012, 97(2): 324-331. 
											 											 | 
										
																													
																						| [10] | 
																						 
											  孙贻娟,黄国宁,孙海翔,等. 关于胚胎移植数目的中国专家共识 [J]. 生殖医学杂,2018, 27(10): 940-945. 
											 											 | 
										
																													
																						| [11] | 
																						 
											  胡立豪,张建平. 子宫颈机能不全的防治 [J/CD]. 中华产科急救电子杂志,2018, 7(4): 230-235. 
											 											 | 
										
																													
																						| [12] | 
																						 
											  姚书忠. 宫颈机能不全诊治过程中存在的争议和思考 [J].中国实用妇科与产科杂志,2017, 33(1): 31-35. 
											 											 | 
										
																													
																						| [13] | 
																						 
											  Grady R, Alavi N, Vale R, et al. Elective single embryo transfer and perinatal outcomes: a systematic review and meta-analysis [J]. Fertil Steril, 2012, 97(2): 324-331. 
											 											 | 
										
																													
																						| [14] | 
																						 
											  American College of Obstetricians and Gynecologists. ACOG Practice Bulletin No.190: Gestational Diabetes Mellitus [J]. Obstet Gynecol, 2018, 131(2): e49-e64. 
											 											 | 
										
																													
																						| [15] | 
																						 
											  Wang YA, Chughtai AA, Farquhar CM, et al. Increased incidence of gestational hypertension and preeclampsia after assisted reproductive technology treatment [J]. Fertil Steril, 2016, 105(4): 920-926. 
											 											 | 
										
																													
																						| [16] | 
																						 
											  American College of Obstetricians and Gynecologists.ACOG Practice Bulletin No. 202: Gestational Hypertension and Preeclampsia [J]. Obstet Gynecol, 2019, 133(1): e1-e25. 
											 											 | 
										
																													
																						| [17] | 
																						 
											  Royal College of Obstetricians and Gynaecologists. Placenta Praevia and Placenta Accreta: Diagnosis and Management. Green-top Guideline No. 27a [J]. BJOG, 2018:1-48. 
											 											 | 
										
																													
																						| [18] | 
																						 
											  Zou LY, Wang X, Ruan Y, et al. Preterm birth and neonatal mortality in China in 2011 [J]. Int J Gynaecol Obstet. 2014, 127(3): 243-247. 
											 											 | 
										
																													
																						| [19] | 
																						 
											  ACOG. Practice Bulletin No. 159: Management of Preterm Labor [J]. Obstet Gynecol, 2016, 127(1): e29-e38. 
											 											 |