title: A critical difference.
authors.affiliation: Walton Centre for Neurology and Neurosurgery NHS Trust, Liverpool.
authors.forename: J
authors.initials: J
authors.lastname: Poston
mesh_terms: D001513:Beds; D003422:Critical Care; D006801:Humans; D009068:Movement; D003668:Pressure Ulcer / Q000517:prevention & control*