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The vomiting page says that vomiting involves decreased intrathoracic pressure and involves no esophageal retroperistalsis, but this page contradicts that (or is otherwise unclear in a manner that made me suspect contradiction). This should be addressed with added clarity in one or both articles. — Preceding unsigned comment added by 2602:304:AB31:D229:103D:AE97:657E:C5B (talk) 13:51, 21 October 2013 (UTC)[reply]