title: Medium-firm mattresses reduced pain-related disability more than firm mattresses in chronic, nonspecific low-back pain.
authors.affiliation: University of North Carolina at Chapel Hill and UNC Hospitals, Chapel Hill, North Carolina, USA.
authors.forename: Nortin M
authors.initials: NM
authors.lastname: Hadler
authors.forename: Arthur T
authors.initials: AT
authors.lastname: Evans