title: Selection biases in semen study?
authors.forename: N G
authors.initials: NG
authors.lastname: Berman
authors.forename: C
authors.initials: C
authors.lastname: Wang
authors.forename: C A
authors.initials: CA
authors.lastname: Paulsen
mesh_terms: D000328:Adult; D003718:Denmark; D005260:Female; D006801:Humans; D008297:Male; D010560:Personnel Selection; D012661:Semen / Q000502:physiology*; D013076:Sperm Count