Cabezas, C. et al. 2020. Prevalence of HBV, HDV and retrovirus infection in the matsés ethnic group in Loreto, Peru. Revista Peruana de Medicina Experimental y Salud Pública. 37, 2 (Jun. 2020), 259–64. DOI:https://doi.org/10.17843/rpmesp.2020.372.4696.