Abd el-Khallek, Enjy Yousry, Sami mohamed Zaki, Abeer Mohammed Abo el-Ela, Mohammed Abd el-Rashid Allam, Mahmoud Bastawy Ismail, and Mahmoud Abd el-Rashid. 2018. “Serum Level of Rheumatoid Factor and Anti-Nuclear Anti Bodies in Patients With Helicobacter Pylori Related Gastric Lesions”. Journal of Medical and Pharmaceutical Sciences 2 (3): 72-67. https://doi.org/10.26389/AJSRP.S070518.