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.
Raper SE, Burwen SJ, Barker ME, Jones AL.Raper SE, et al. Among authors: burwen sj.Gastroenterology. 1987 May;92(5 Pt 1):1243-50. doi: 10.1016/s0016-5085(87)91084-5.Gastroenterology. 1987.PMID: 3493940
Marti U, Burwen SJ, Wells A, Barker ME, Huling S, Feren AM, Jones AL.Marti U, et al. Among authors: burwen sj.Hepatology. 1991 Jan;13(1):15-20.Hepatology. 1991.PMID: 1988335
Marti U, Burwen SJ, Jones AL.Marti U, et al. Among authors: burwen sj.Hepatology. 1989 Jan;9(1):126-38. doi: 10.1002/hep.1840090122.Hepatology. 1989.PMID: 2642290Review.