Shijian Liu Hongwei Zhang Chunying Gu Jianhua Yin Yongchao He Jiaxin Xie Guangwen Cao

sima besharat liver and pancreatobiliary diseases research center, digestive disease research institute, tehran university of medical sciences, tehran, ir iran; golestan research center of gastroentrology and hepatology, golestan university of medical sciences, gorgan, ir iran hossein poustchi liver and pancreatobiliary diseases research center, digestive disease research institute, tehran university of medical sciences, tehran, ir iran; liver and pancreatobiliary diseases research center, digestive diseases research institute, tehran university of medical sciences, north kargar ave., shariati hospital, p.o. box: 14117-13135, tehran, ir iran. tel: +98-2182415204, fax: +98-21 82415400 ashraf mohamadkhani liver and pancreatobiliary diseases research center, digestive disease research institute, tehran university of medical sciences, tehran, ir iran aezam katoonizadeh liver and pancreatobiliary diseases research center, digestive disease research institute, tehran university of medical sciences, tehran, ir iran abdolvahab moradi golestan research center of gastroentrology and hepatology, golestan university of medical sciences, gorgan, ir iran gholamreza roshandel liver and pancreatobiliary diseases research center, digestive disease research institute, tehran university of medical sciences, tehran, ir iran; golestan research center of gastroentrology and hepatology, golestan university of medical sciences, gorgan, ir iran