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Koukias N, Woodland P, Yazaki E, , Sifrim D.  Supragastric Belching: Prevalence and Association With Gastroesophageal Reflux Disease and Esophageal Hypomotility.  J Neurogastroenterol Motil 2015;21:398-403.  https://doi.org/10.5056/jnm15002