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.
所谓的胃灼热、胃酸逆流或是胃食道逆流是一种慢性的胃病，罹病的人不仅痛苦，治疗更是所费不赀，标准治疗程序 (包括非处方药) 与手术是个商机庞大的市场；庆幸的是坊间还有很多简单有效的传统替代疗法，如苹果醋、肉桂及生姜等材料，对大多数的人来说都非常容易取得。
Standard interventions of medication and surgery also include over the counter remedies for which there is a huge market. Fortunately, there are many effective alternative and traditional solutions.
这样做不仅能避免体重额外增加，还能降低食道胃酸逆流的风险和罹患其他加重睡眠问题的消化系疾病的可能。
Not only could it help prevent extra weight gain, it can also lower the risk of gastroesophageal reflux and other digestive problems that may compound sleep problems.
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