Objectives: Gastroesophageal flap valve can be divided into a four-grade system and this system can well predict the prevalence of gastroesophageal reflux disease.
研究动机：胃食道皮瓣可区分为四级。而这种分类系统，可以预测胃食道逆流疾病的发生率。
Objectives: Gastroesophageal flap valve can be divided into a four-grade system and this system can well predict the prevalence of gastroesophageal reflux disease.
研究动机：胃食道皮瓣可区分为四级。而这种分类系统，可以预测胃食道逆流疾病的发生率。
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