00422nas a2200157   4500000000100000000000100001008004100002100001300043700001800056700001400074700001300088245011400101300001000215490000700225022003200232       2002                            d1 aJ. Lewis1 aC. Brensinger1 aW. Bilker1 aB. Strom00aValidity and completeness of the General Practice Research Database for studies of inflammatory bowel disease  a211-80 v11  a1053-8569 (Print) 1053-8569