Nationwide epidemiological survey of autoimmune pancreatitis in Japan in 2016

To further clarify the clinico-epidemiological features of autoimmune pancreatitis (AIP) in Japan, we conducted the fourth nationwide epidemiological survey. This study consisted of two stage surveys; the number of AIP patients was estimated by the first survey and their clinical features were assessed by the second survey. We surveyed the AIP patients who had visited hospitals in 2016. The estimated number of AIP patients in 2016 was 13,436,...