title: Clinical trials, outcomes research, and practice guidelines in surgery: introduction.
authors.forename: R S
authors.initials: RS
authors.lastname: McLeod
mesh_terms: D003362:Cost-Benefit Analysis; D019317:Evidence-Based Medicine; D006801:Humans; D017063:Outcome Assessment, Health Care; D017410:Practice Guidelines as Topic; D016032:Randomized Controlled Trials as Topic; D012107:Research Design; D013514:Surgical Procedures, Operative / Q000191:economics