@article {Vennamaneni:1 September 2001:0002-9270:2798,
	author = "Vennamaneni, S.R.",
	author = "Bonner, G.F.",
	title = "Use of Azathioprine or 6-mercaptopurine for treatment of steroid-dependent lymphocytic and collagenous colitis",
	journal = "The American Journal of Gastroenterology",
	volume = "96",
	year = "1 September 2001",
	abstract = "",
	pages = "2798-2799(2)",
	url = "http://www.ingentaconnect.com/content/bsc/ajg/2001/00000096/00000009/art02707"
	doi = "doi:10.1016/S0002-9270(01)02707-1"
}