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Endoscopic findings of an upper gastrointestinal (upper GI) series. N1/P1, esophagus; N2/P2, cardia; N3/P3, gastric fundus; N4/P4, antrum stomach body; N5/P5, duodenal bulb; and N6/P6, descending portion. N stands for healthy subjects and P presents for polycythemia ones.
