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Citric acid as the test meal for the 13C-urea breath test.
Graham DY, Runke D, Anderson SY, Malaty HM, Klein PD. Graham DY, et al. Among authors: runke d. Am J Gastroenterol. 1999 May;94(5):1214-7. doi: 10.1111/j.1572-0241.1999.01069.x. Am J Gastroenterol. 1999. PMID: 10235196