Sansanee Tanjatham. (1999) Prevalence of virulence factors producing strains of helicobacter pylori and their association to peptic ulcer in patients at Rajavithi hospital. Mahidol University,:ม.ป.ท.Sansanee Tanjatham. 1999. Prevalence of virulence factors producing strains of helicobacter pylori and their association to peptic ulcer in patients at Rajavithi hospital. ม.ป.ท.:Mahidol University,;Sansanee Tanjatham. Prevalence of virulence factors producing strains of helicobacter pylori and their association to peptic ulcer in patients at Rajavithi hospital. ม.ป.ท.:Mahidol University, 1999. Print.