title: Clumpers and splitters.
authors.forename: P E
authors.initials: PE
authors.lastname: Mahan
mesh_terms: D002965:Classification; D005152:Facial Muscles / Q000033:anatomy & histology*; D006801:Humans; D013703:Temporal Muscle / Q000033:anatomy & histology* / Q000294:innervation; D009626:Terminology as Topic