title: The authors respond.
authors: Robert J
authors: RJ
authors: McCarthy
authors: Stephen H
authors: SH
authors: Levine
authors: J Michael
authors: JM
authors: Reed
mesh_terms: D000818:Animals; D002415:Cats / Q000502:physiology*; D005260:Female; D008297:Male; D008954:Models, Biological; D011155:Population Control / Q000379:methods*