title: On the origin of the "six non-natural things" in Galen.
authors.forename: L
authors.initials: L
authors.lastname: García-Ballester
mesh_terms: D000076145:Greece, Ancient; D049690:History, Ancient; D006801:Humans; D010686:Philosophy, Medical / Q000266:history*; D013812:Therapeutics / Q000266:history*