title: RETRACTED: Clomiphene citrate or letrozole for ovulation induction in women with polycystic ovarian syndrome: a prospective randomized trial.
abstract: This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal).
  
  This article has been retracted at the request of the ASRM Publications Committee
  
  Several reports of randomized clinical trials were recently the subject of an investigation conducted by the publications committee of the ASRM. The committee reviewed concerns related to the validity of data reported in those reports. The committee noted significant duplication of data reported in this manuscript with data reported in another journal (PMID 17364286; https://doi.org/10.1080/00016340601090337) and another publication in Fertility and Sterility (PMID: 18692823; https://doi.org/10.1016/j.fertnstert.2008.06.013) pertaining to different study groups that could not be explained. As we cannot vouch for the validity of the data, we have issued a retraction of this paper.
authors.affiliation: Department of Obstetrics and Gynecology, Mansoura University, Mansoura, Egypt. Electronic address: ambadawy@yahoo.com.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Badawy
authors.affiliation: Department of Clinical Pathology, Mansoura University, Mansoura, Egypt.
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Abdel Aal
authors.affiliation: Department of Radiology, Mansoura University, Mansoura, Egypt.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Abulatta
mesh_terms: D000022:Abortion, Spontaneous; D000328:Adult; D047072:Aromatase Inhibitors / Q000627:therapeutic use*; D002996:Clomiphene / Q000627:therapeutic use*; D004305:Dose-Response Relationship, Drug; D004717:Endometrium / Q000473:pathology / Q000503:physiopathology; D004958:Estradiol / Q000097:blood; D005260:Female; D005300:Fertility Agents, Female / Q000627:therapeutic use*; D006801:Humans; D000077289:Letrozole; D009570:Nitriles / Q000627:therapeutic use*; D006080:Ovarian Follicle / Q000473:pathology / Q000503:physiopathology; D010062:Ovulation Induction / Q000379:methods*; D011085:Polycystic Ovary Syndrome / Q000188:drug therapy* / Q000473:pathology / Q000503:physiopathology; D011247:Pregnancy; D018873:Pregnancy Rate; D011374:Progesterone / Q000097:blood; D011446:Prospective Studies; D014230:Triazoles / Q000627:therapeutic use*
chemical_list: D047072:Aromatase Inhibitors; D005300:Fertility Agents, Female; D009570:Nitriles; D014230:Triazoles; D002996:Clomiphene; D011374:Progesterone; D004958:Estradiol; D000077289:Letrozole