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Serum antibodies to carbonic anhydrase (CA) IV peptide 4 by ELISA in patients with definite autoimmune pancreatitis (definite AIP, n = 15), probable AIP (n = 14), alcoholic chronic pancreatitis (ACP, n = 15), pancreatic cancer (PC, n = 14), Sjögren’s syndrome (SjS, n = 20), and normal controls (NC, n = 26). The broken line indicates a cut off value defined by the mean (2 SD) in NC.
