1 Hull MG,Glazener CM,Kelly NJ,et al.Population study of causes,treatment,and outcome of infertility.Br Med J (Clin Res Ed),1985,14:1693-1697. 2 Dunson DB,Baird DD,Colombo B.Increased infertility with age in men and women.Obstet Gynecol,2004,103:51-56. 3 Guzick DS,Sullivan MW,Adamson GD,et al.Efficacy of treatment for unexplained infertility.Fertil Steril,1998,70:207-713. 4 Chian RC,Buckett WM,Abdul Jalil AK,et al.Natural-cycle in vitro fertilization combined with in vitro maturation of immature oocytes is a potential approach in infertility treatment.Fertil Steril,2004,82:1675-1678. 5 Lim JH,Yang SH,Xu Y,et al.Selection of patients for natural cycle in vitro fertilization combined with in vitro maturation of immature oocytes.Fertil Steril,2009,91:1050-1055. 6 Xu Y,Li J,Zhou G,et al.Clinical outcomes for various causes of infertility with natural cycle in vitro fertilization combined with in witro maturation of immature oocytes.Fertil Steril,2010,94:777-780. 7 Guzick DS,Carson SA,Coutifaris C,et al.Efficacy of superovulation and intrauterine insemination in the treatment of infertility.N Engl J Med,1999,340:177-783. 8 Liu DY,Baker HW. Disordered zona pellucida-induced acrosome reaction and failure of in vitro fertilization in patients with unexplained infertility.Fertil Steril,2003,79:74-80. 9 Chaudhury K,Das T,Chakravarty B,et al.Acrosin activity as a potential marker for sperm membrane characteristics inunexplained male infertility.Fertil Steril,2005,83:104-109. 10 Katayose H,Yanagida K,Hayashi S,et al.Fertilization failure from a sperm chromatin defect in couples with unexplained infertility.J Reprod Med,2004,49:727-732. 11 Aboulghar MA,Mansour RT,Serour GI,et al.Management of long-standing unexplained infertility:A prospective study.Am J Obstet Gynecol,1999,181:371-375. 12 Mackenna AI,Zegers-Hochschild F,Fernandez EO,et al.Fertilization rate in couples with unexplained infertility.Hum Reprod,1992,7:223-226. 13 郑晓英,刘平,廉颖,等.体外受精治疗不明原因不孕受精方法的探讨.生殖与避孕,2005,28:264-267. 14 Schimberni M,Morgia F,Colabianchi J,et al.Natural-cycle in vitro fertilization in poor responder patients:a survey of 500 consecutive cycles.Fertil Steril,2009,92:1297-1301. 15 Check JH,Bollendorf A,Summers-Chase D,et al.Conventional oocyte insemination may result in a better pregnancy outcome than intracytoplasmic sperm injection (ICSI) for unexplained infertility.Clin Exp Obstet Gynecol,2009,36:150-151. 16 李国强,田莉.体外受精胚胎移植技术治疗不明原因不孕的疗效分析.临床医药,2006,7:81-82. 17 Lintsen AM,Pasker-de Jong PC,de Boer EJ,et al.Effects of subfertility cause,smoking and body weight on the success rate of IVF.Hum Reprod,2005,20:1867-1875. 18 Omland AK,Abyholm T,Fedorcsák P,et al.Pregnancy outcome after IVF and ICSI in unexplained,endometriosis-associated and tubal factor infertility.Hum Reprod,2005,20:722-727. 19 Reyftmann L,Déchaud H,Loup V,et al.Natural cycle in vitro fertilization cycle in poor responders.Gynecol Obstet Fertil,2007,35:352-358.