a comparative epidemiological study of hepatitis b and hepatitis d virus infections in yanomami and piaroa amerindians of amazonas state, venezuela. | to report the prevalences of hepatitis b (hbv) and hepatitis d (hdv) infections in remote and more accessible yanomami and piaroa venezuelan amazonian amerindian populations; to estimate incidence per susceptible. | 2010 | 20561309 |