title: Cut-points for the measurement of pain: the choice depends on what you want to study.
authors.affiliation: Department of Biostatistics and Epidemiology, Anesthesiology, and Neurology, University of Pennsylvania School of Medicine, 423 Guardian Drive, Room 816, Philadelphia, PA 19104, USA.
authors.forename: John T
authors.initials: JT
authors.lastname: Farrar