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Very early‐onset inflammatory bowel disease in Japan: A nationwide survey

Very early‐onset inflammatory bowel disease is defined as inflammatory bowel disease diagnosed before 6 years of age. Very early‐onset inflammatory bowel disease has various differential diagnoses, including primary immunodeficiency disorders, and is known to be resistant to conventional treatment. Therefore, global attention is required to manage this challenging condition. We conducted a retrospective epidemiological survey of the number of patients, final diagnosis, and examinations performed to diagnose very early‐onset inflammatory bowel disease in Japan.