nodes without involvement of peripheral lymph nodes, liver, spleen, bone marrow or peripheral blood [5]. Forty percent of all non Hodgkin's lymphomas (NHL) arise at extranodal sites [9], with the GI as the commonest extranodal site constituting 4-8% in the Western countries and up to 25% of cases in the Middle East [35]. The stomach is the most frequent site of involvement in Western countries,...

The study of various countries rail transportation indicators is an appropriate criterion for evaluating the existing performance of Iranian railways. The experiences of other countries can be used to improve the efficiency of Iran’s rail transportation. At the beginning of the study, in order to compare the Iranian railway performance with railways of other countries, various efficiency indica...

Middle East respiratory syndrome (MERS) is a new emerging infectious disease that was firstly detected in the Middle East[1-3]. The infection was firstly confined within the Middle East. The first case was from Saudi Arabia in 2012. As noted by Banik et al.[4], since its discovery in 2012, MERS coronavirus has reached 23 countries affecting about 1 100 people, including a dozen children, and cl...

Background: Helicobacter pylori is a pathogenic bacteria found in the gastric mucosa of both children and adults. Our goal was to use an endoscopic method look at prevalence H. with gastrointestinal complaints. Methods: This cross-sectional research conducted 2022 on pediatric patients who received or duodenal biopsies by endoscopy. We collected data from medical reports regarding patients' age...