An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Grade A, Pulliam G, Johnson C, Garewal H, Sampliner RE, Fass R.Grade A, et al. Among authors: johnson c.Am J Gastroenterol. 1997 Nov;92(11):2040-3.Am J Gastroenterol. 1997.PMID: 9362188
Morales TG, Bhattacharyya A, Johnson C, Sampliner RE.Morales TG, et al. Among authors: johnson c.Am J Gastroenterol. 1997 Oct;92(10):1818-22.Am J Gastroenterol. 1997.PMID: 9382043
Fass R, Ofman JJ, Gralnek IM, Johnson C, Camargo E, Sampliner RE, Fennerty MB.Fass R, et al. Among authors: johnson c.Arch Intern Med. 1999 Oct 11;159(18):2161-8. doi: 10.1001/archinte.159.18.2161.Arch Intern Med. 1999.PMID: 10527293Clinical Trial.