For citations:
Morozov I.A., Ilchenko L.Yu., Gromova N.I., Fyedorov I.G., Gordeychuk I.V., Knyazhentseva A.K., Zverkova E.V., Mikhaylov M.I. Issues occult hepatitis B virus infection. Russian Journal of Gastroenterology, Hepatology, Coloproctology. 2012;22(4):58-65. (In Russ.)