title: How many observations are required for evaluation and quality assurance?
authors: D
authors: D
authors: Birnbaum
mesh_terms: D003428:Cross Infection / Q000517:prevention & control*; D006801:Humans; D011785:Quality Assurance, Health Care / Q000592:standards*; D012107:Research Design; D012494:Sampling Studies; D014481:United States