Gastrointestinal endoscopy. Preface.
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D015179:Colorectal Neoplasms / Q000175:diagnosis* / Q000601:surgery*; D020776:Endoscopes, Gastrointestinal; D016099:Endoscopy, Gastrointestinal / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male