Prevalence study of Helicobacter pylori infection from normal persons in Thailand von Piyada Wangroongsarb, Karun Suthivarakom, Chutima jitaprasartsin, Varocha Mahachai, Piyathida Hansomboon, Padet Noophan, Rattigorn Chanatrirattanaphan, Theeranant Sappajit, Comsan Lertkupinij, Thanitchai Khamthalang, Wattanapong woota, Somchai Iuengjaru, Pathom Wawanpanyalert

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