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Catha
Hepacivirus
Helicobacter pylori
Plant Leaves
Yemen
Mastication
Hepatitis C
Blood Pressure
Dyspepsia
Helicobacter Infections
Hepatitis B
Central Nervous System Stimulants
Alkaloids
Plant Extracts
Hepatitis C Antibodies
Interferon-alpha
Prevalence
Prospective Studies
Seroepidemiologic Studies
Cross-Over Studies
Co-Publications
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