AIP and autoimmune pancreatitis: Thus, the recent description of a new AIP type, now classified as the AIP-4 type, is strongly associated with significant sunlight exposure and calls for a reclassification of AIP types that includes AIP-4, whereby additional efforts are essential to identify the causative factors of the AIP-1 and AIP-2 types, including drugs commonly used in the respective cohorts, which also comprise older patients with comorbidities.