title: How to explain the discordant change of ulcerative colitis and Crohn disease in adjacent or even the same regions and time periods.
authors.affiliation: Department of Surgery, UMDNJ-New Jersey Medical School, Newark.
authors.forename: Xiaofa
authors.initials: X
authors.lastname: Qin
mesh_terms: D005260:Female; D019456:Health Transition; D006801:Humans; D015212:Inflammatory Bowel Diseases / Q000453:epidemiology*; D008297:Male