title: Methodological studies of systematic reviews: is there publication bias?
authors.forename: A
authors.initials: A
authors.lastname: Laupacis
mesh_terms: D015982:Bias; D004965:Estrogen Antagonists / Q000627:therapeutic use*; D006801:Humans; D008297:Male; D016017:Odds Ratio; D009845:Oligospermia / Q000188:drug therapy*; D011643:Publishing; D016032:Randomized Controlled Trials as Topic; D012107:Research Design; D016896:Treatment Outcome
chemical_list: D004965:Estrogen Antagonists