title: Response: design challenges in trials of multimodal analgesia.
authors.affiliation: Department of Anesthesiology, Copenhagen University Hospital, Hvidovre, Denmark The Lundbeck Centre for Fast-track Hip and Knee Arthroplasty, Copenhagen, Denmark.
authors.forename: Troels Haxholdt
authors.initials: TH
authors.lastname: Lunn
mesh_terms: D000698:Analgesia; D006801:Humans; D059408:Pain Management; D010149:Postoperative Pain