We are grateful to the Kelantan State Orang Asli Welfare Department, the village elders (“Tok Batin”), the medical assistants, and all the study subjects for their cooperation and assistance during the study. We also thank Venkatesh R. Nair and Gurjeet Kaur (Pathology Department, Universiti Sains Malaysia) for their help with histopathological diagnosis of Helicobacter pylori infection during validation of the serology tests.
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