title: Semen quality--has it changed during the last decades?
authors.affiliation: Kvinnekliniken, Bergen, Norway.
authors.forename: M
authors.initials: M
authors.lastname: Ulstein
mesh_terms: D004967:Estrogens / Q000032:analysis; D006801:Humans; D007248:Infertility, Male / Q000209:etiology; D008297:Male; D012661:Semen / Q000737:chemistry / Q000502:physiology*; D013076:Sperm Count
chemical_list: D004967:Estrogens