Social, economic factors prompted credentialing study.
D000068:Accreditation; D000575:American Nurses' Association; D002568:Certification; D005069:Evaluation Studies as Topic; D006801:Humans; D008008:Licensure, Nursing; D009729:Nursing / Q000592:standards*; D009732:Nursing Care / Q000592:standards; D012956:Societies, Nursing; D012959:Socioeconomic Factors; D014481:United States