%0 Journal Article %T Risk Factors of Cholangiocarcinogenesis in Parasitization of a Natural Focal Ecopathogen Helminth <i>Opisthorchis felineus</i> %A Fedorov, N.. %A Rybka, A.. %K %J Bulletin of Nizhnevartovsk State University %D 2022 %N %P 14 %I Nizhnevartovsk State University