mahsa motavaf 1) baqiyatallah research center for gastroenterology and liver diseases, baqiyatallah university of medical sciences. 2) tehran hepatitis center, ir iran mahsa motavaf baqiyatallah research center for gastroenterology and liver diseases, baqiyatallah university of medical sciences, tehran, ir iran; tehran hepatitis center, tehran, ir iran seyed moayed moayed alavian 1) baqiyatallah research center for gastroenterology and liver diseases, baqiyatallah university of medical sciences. 2) tehran hepatitis center, ir iran +98-2188945186, [email protected]; 1) baqiyatallah research center for gastroenterology and liver diseases, baqiyatallah university of medical sciences. 2) tehran hepatitis center, ir iran +98-2188945186, [email protected] seyed moayed alavian baqiyatallah research center for gastroenterology and liver diseases, baqiyatallah university of medical sciences, tehran, ir iran; tehran hepatitis center, tehran, ir iran; corresponding author at: seyed moayed alavian, baqiyatallah research center for gastroenterology and liver disease, baqiyatallah university of medical sciences, tehran, ir iran. tel.: +98-2188945186, fax: +98-2188945188, e-mail: