FGF23 and bile duct papillary neoplasm: Whereas the Kruskal-Wallis test yielded a significant result (H=7.23, df = 2, p= 0.027), the post hoc pairwise comparison revealed significant differences in FGF-23 values between patients with moderate IPN and those with extensive IPN (p= 0.016) and trend for significant differences between no IPN and extensive IPN groups (p=0.052).