Distribution of hepatitis B virus genotypes and viral load levels in Brazilian chronically infected patients in São Paulo city Distribuição dos genótipos do vírus da hepatite B e n... oleh Rosana Alcalde, Fernando Lucas Melo, Anna Nishiya, Suzete Cleusa Ferreira, Mario Dante Langhi Júnior, Simone Sena Fernandes, Luis Augusto Marcondes, Alberto José Silva Duarte, Jorge Casseb