%0 Journal Article %T Occult hepatitis B virus infection: influence of S protein variants %A Jun Li %A Ling Zhang %A Xu Li %A Yafei Zhang %A Yu Dai %A Zhenhua Zhang %J Archive of "Virology Journal". %D 2016 %R 10.1186/s12985-016-0464-z %K Hepatitis B surface antigen %K Hepatitis B virus %K Occult %K Variant %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4717550/