INS and autoimmune pancreatitis: PPD >5 mm correlated positively with P-insulin (r = 0.32, p = 0.03) and P-C-peptide (r = 0.50, p < 0.001) in the AIP cases but not in the controls, PPD >5 mm vs. P-insulin (r = 0.28, p = 0.06) and PPD >5 mm vs. P-C-peptide (r = 0.23, p = 0.12).