title: Are semen quality and male fertility changing?
authors: R J
authors: RJ
authors: Sherins
mesh_terms: D004781:Environmental Exposure; D005298:Fertility; D006801:Humans; D007248:Infertility, Male / Q000209:etiology*; D008297:Male; D012661:Semen / Q000502:physiology*; D013076:Sperm Count; D013094:Spermatozoa / Q000502:physiology*