Mansour-Ghanaei, Fariborz, GI Cancer Screening and Prevention Research Center, Guilan University of Medical Sciences, Rasht, Iran; Gastrointestinal and Liver Diseases Research Center, Guilan University of Medical Sciences, Razi Hospital, Sardar-Jangle Ave, Rasht, Iran, Telephone: +98-1315535116, Fax: +98-1315534951, E-mail: fmansourghanaei@gmail.com, Iran, Islamic Republic of