Familial and environmental factors involved in inflammatory bowel disease in rural Nebraska.
D000293:Adolescent; D000328:Adult; D000368:Aged; D003093:Colitis, Ulcerative / Q000209:etiology / Q000235:genetics*; D003424:Crohn Disease / Q000209:etiology / Q000235:genetics*; D004777:Environment; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009329:Nebraska; D012424:Rural Population