title: Epidemiology of infertility.
authors.affiliation: Johns Hopkins University School of Hygiene and Public Health, Baltimore, Maryland.
authors.forename: R H
authors.initials: RH
authors.lastname: Gray
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D015984:Causality; D006801:Humans; D007246:Infertility / Q000453:epidemiology* / Q000209:etiology / Q000628:therapy; D009819:Office Visits / Q000706:statistics & numerical data; D015995:Prevalence; D014481:United States / Q000453:epidemiology