Seroprevalence of anti-Helicobacter pylori and anti-CagA antibodies among healthy children according to age, sex, ABO blood groups and Rh status in south-east of Iran - JAFARZADEH, Abdollah; AHMEDI-KAHANALI, Jafar; BAHRAMI, Mehdi; TAGHIPOUR, Zahra (Turkish Journal of Gastroenterology, 2007)