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D016099:Endoscopy, Gastrointestinal / Q000592:standards* / Q000639:trends; D005260:Female; D017408:Guidelines as Topic; D006801:Humans; D008297:Male; D017063:Outcome Assessment, Health Care; D011787:Quality of Health Care / Q000592:standards*; D012955:Societies, Medical; D014481:United States