There are Billroth-I, Billroth-II, Billroth-II with Braun, and Roux-en-Y reconstruction after distal gastrectomy. Hypothesis: Billroth-II modified method is non-inferior to Roux-en-Y method in terms of reducing reflux esophagitis after distal gastrectomy for gastric cancer patients.
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Reflux esophagistis
Timeframe: on the 12th month after surgery