Dried blood spots as a practical and inexpensive source for human immunodeficiency virus and hepatitis C virus surveillance by Antonio Carlos de Castro Toledo Jr., José Nélio Januário, Renata Maria Silva Rezende, Arminda Lúcia Siqueira, Bernardo Freire de Mello, Érica Ligorio Fialho, Raquel Andrade Ribeiro, Hélia Lemos da Silva, Érika Carvalho Pires, Taynaná César Simões, Dirceu Bartolomeu Greco

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