1 Surrey ES.Gonadotropin-releasing hormone agonist and add-back therapy:what do the data show? Curr Opin Obstet Gynecol,2010,22:283-288. 2 Koga K,Takemura Y,Osuga Y,et al.Reeurrence of ovarian endometrioman after laparoscopic excision.Hum Reprod,2006,21:2171-2174. 3 Szpak R,Drosdzl A,Zypule V,et al.Health-realated qualityof life in women with endometriosis.Wiad Lek,2009,62:129. 4 Jee BC,Lee JY,Suh CS,et al.Impact of GnRH agonist treatment on recurrence of ovarian endometriomas after conservative laparoscopic surgery.Fertil Steril,2009,19:40-45. 5 Kitawaki J,Kusuki I,Yamanaka K,et al.Maintenance therapy with dienogest following gonadotmpin-releasing hormone agonist treatment for endometriosis.associated pelvic pain.Eur J Obstet Gynecol Reprod Biol,2011,157:212-216. 6 Khan KN,Kitajima M,Hiraki K,et al.Cell proliferation effect of GnRH agonist on pathological lesions of women with endometriosis,adenomyosis and uterine myoma.Hum Reprod,2010,25:2878-2890. 7 Mordli M,Rocca ML,Venturella R,et al.Improvernent in chronic pelvic pain after gonadotmpin releasing hormone analogue(GnRH-a) adrninistration in premenopausal women suffring from adenonlyosis or endometriosis:a retmspective study.Gynecol Endocrinol,2013,29:305. 8 Streuli I,de Ziegler D,Santulli P,et al.An update on the pharmacological management of endometriosis.Expert Opin Pharmacother,2013,14:291. 9 Zou S,Long Q,Zhang S,et al.Oral continuous combined 0.5mg estradiol valerate and 5mg dydrogesterone US daily add-back therapy during post-operative GnRH agonist treatment for endometriosis in Chinese women.Int J Clin Exp Med,2013,6:67-73. (