title: The Frequencies of Twins, Relative to Age of Mothers, in American Populations.
authors.affiliation: Departments of Zoology, University of Rochester, New York.
authors.forename: T
authors.initials: T
authors.lastname: Enders
authors.forename: C
authors.initials: C
authors.lastname: Stern
mesh_terms: D006801:Humans; D009035:Mothers; D014427:Twins; D014481:United States