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Vazquez Roque MI, Camilleri M, Clark MM, Tepoel DA, Jensen MD, Graszer KM, Kalsy SA, Burton DD, Baxter KL, Zinsmeister AR.Vazquez Roque MI, et al. Among authors: baxter kl.Clin Gastroenterol Hepatol. 2007 Jul;5(7):829-37. doi: 10.1016/j.cgh.2007.02.037. Epub 2007 Jun 4.Clin Gastroenterol Hepatol. 2007.PMID: 17544870Clinical Trial.