title: Review.
authors.forename: Shawn
authors.initials: S
authors.lastname: Hancock
authors.forename: Patrick R
authors.initials: PR
authors.lastname: Pfau
references.citation: Gastroenterol Hepatol (N Y). 2010 Jul;6(7):459-62
references.pmid: 20827371
references.citation: J Clin Oncol. 2010 Jun 1;28(16):e250-1
references.pmid: 20439636
references.citation: AIDS. 2006 Aug 1;20(12):1645-54
references.pmid: 16868446
references.citation: Cancer. 2002 Jul 1;95(1):147-54
references.pmid: 12115328
references.citation: J Clin Oncol. 1989 Sep;7(9):1201-7
references.pmid: 2671281
references.citation: Lancet. 1990 Jan 20;335(8682):123-8
references.pmid: 1967430
references.citation: Pathol Res Pract. 2007;203(4):227-31
references.pmid: 17379429
references.citation: Cancer. 1995 Mar 15;75(6):1376-85
references.pmid: 7882289
references.citation: Lancet Infect Dis. 2002 May;2(5):281-92
references.pmid: 12062994
references.citation: Science. 1994 Dec 16;266(5192):1865-9
references.pmid: 7997879
references.citation: Cancer. 2004 Jun 15;100(12):2644-54
references.pmid: 15197808
references.citation: J Clin Oncol. 1998 Feb;16(2):683-91
references.pmid: 9469358
references.citation: AIDS. 2003 Jul 25;17(11):F17-22
references.pmid: 12853764
references.citation: Semin Oncol. 1987 Jun;14(2 Suppl 3):13-8
references.pmid: 3603056
references.citation: J Natl Cancer Inst. 2010 Jun 2;102(11):784-92
references.pmid: 20442214
references.citation: AIDS. 2010 Jun 19;24(10):1549-59
references.pmid: 20502317
references.citation: Clin Infect Dis. 2008 Aug 1;47(3):410-7
references.pmid: 18582203
references.citation: Cancer. 2006 Nov 1;107(9):2282-90
references.pmid: 16998933
references.citation: Lancet. 2006 May 6;367(9521):1495-502
references.pmid: 16679162
references.citation: Endoscopy. 2007 Feb;39 Suppl 1:E77
references.pmid: 17354177
references.citation: AIDS. 1999 Oct 22;13(15):2105-11
references.pmid: 10546864
references.citation: Br Med J (Clin Res Ed). 1988 Jan 9;296(6615):92-3
references.pmid: 3122968
references.citation: J Cutan Pathol. 1992 Feb;19(1):6-20
references.pmid: 1556269