title: How should we select health professionals for studies?
abstract: The investigation of healthcare professionals' practice patterns has increased sharply, in part driven by the development of practice guidelines; however, the optimal way to select providers is not known. We evaluated three distinct sources of physician specialists for completeness and potential biases. Professional society directories, which are frequently used to identify providers, provided biased populations. A national registry, the American Medical Association master file, produced the most comprehensive, least-biased single source.
authors.affiliation: Kaiser Permanente Division of Research and Department of Medicine, University of California, San Francisco, Calif., USA.
authors.forename: Rajiv
authors.initials: R
authors.lastname: Verma
authors.forename: Douglas A
authors.initials: DA
authors.lastname: Corley
mesh_terms: D000574:American Medical Association; D015982:Bias; D002140:California; D004181:Directories as Topic; D005762:Gastroenterology / Q000592:standards; D006302:Health Services Research / Q000379:methods* / Q000592:standards; D006801:Humans; D017063:Outcome Assessment, Health Care / Q000379:methods* / Q000592:standards; D018579:Patient Selection; D010820:Physicians / Q000592:standards; D010818:Practice Patterns, Physicians' / Q000592:standards; D012042:Registries; D012107:Research Design; D012955:Societies, Medical; D014481:United States