title: A method of selecting a sample of long-staying hospitalized patients, with nosocomial infections as the outcome event.
mesh_terms: D000328:Adult; D000368:Aged; D003428:Cross Infection / Q000453:epidemiology / Q000451:nursing*; D003430:Cross-Sectional Studies; D006785:Hospitals, University; D006801:Humans; D007223:Infant; D007902:Length of Stay; D009657:North Carolina; D009922:Oregon; D010043:Outcome and Process Assessment, Health Care / Q000379:methods*; D012306:Risk; D012494:Sampling Studies