title: Prognostic studies of perioperative risk: robust methodology is needed.
authors: M P W
authors: MP
authors: Grocott
authors: R M
authors: RM
authors: Pearse
mesh_terms: D006801:Humans; D019990:Perioperative Care / Q000379:methods; D011300:Preoperative Care / Q000379:methods*; D011379:Prognosis; D018570:Risk Assessment / Q000379:methods*; D013514:Surgical Procedures, Operative / Q000009:adverse effects*; D016896:Treatment Outcome