title: Assessing pain at face value.
authors.forename: B
authors.initials: B
authors.lastname: Acello
mesh_terms: D000368:Aged; D003072:Cognition Disorders / Q000150:complications; D005145:Face; D006801:Humans; D010146:Pain / Q000145:classification / Q000150:complications; D010147:Pain Measurement / Q000379:methods*