WAINWRIGHT, ROBERT B, MCMAHON, BRIAN J, BENDER, THOMAS R, HEYWARD, WILLIAM L, NAKANISHI, STEVEN, WAINWRIGHT, KAREN Y, FOLIAKI, SUPILE O, ERICKSON, SANDRA L and FIELDS, HOWARD A (1986) Prevalence of hepatitis B virus infection in Tonga: identifying high risk groups for immunization with hepatitis B vaccine. International journal of epidemiology, 15 (4). pp. 567-571.
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