| http://www.w3.org/ns/prov#value | - inserting a first endoscope into a tubular organ of a body of the patient via a natural opening of the patient, including a nose, mouth and anus of the patient, the first endoscope having an insertion tube in which a light marker is accommodated beforehand, the light marker having an engagement member adapted to be engageable with an inner wall of the tubular organ;
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