WALKER, EA. Comorbidity of gastrointestinal complaints, depression, and anxiety in the epidemiologic catchment area (ECA) study. Am J Med. 1992, 92, 26 S-30 S
WALKER, E. Psychiatric illness and irritable bowel syndrome : A comparison with inflammatry bowel disease. Am J Psychiatry. 1990, 147, 1656-1661
LYDIARD, R. Prevalence of psychiatric disorders in patients with irritable bowel syndrome. Psychosomatics. 1993, 34, 229-234
WALKER, EA. Psychiatric diagnosis, sexual and physical victimization, and disability in patients with irritable bowel syndrome of inflammatory bowel disease. Psychol Med. 1995, 25, 1259-1267