Vásquez, Silvia ; Cabezas, C ; García, Bertha... Vásquez S, et al. Prevalence of HBsAg and anti-HBs carriers in pregnant women residents in areas from different endemicity located in central-south departments of Perú. Instituto Peruano de Energía Nuclear. Informe Científico Tecnológico 1998-2001. Lima: IPEN; 2002. p. 201-206..
,
2002