High prevalence of hepatitis B subgenotype D4 in northeast Brazil: An ancient relic from African continent? - Cruz-santos, M. D; Gomes-gouvêa, M. S; Costa-nunes, J. D; Malta-romano, C; Teles-sousa, M; Fonseca-barros, L. M; Carrilho, Flair José; Paiva-ferreira, A. D. S; Rebello-pinho, J. R (Annals of hepatology, 2018)