Prevalence of cagA and vacA genes in isolates from patients with Helicobacter pylori-associated gastroduodenal diseases in Recife, Pernambuco, Brazil by Brito Carlos AA, Silva Lenôra MB, Jucá Norma, Leal Nilma C, Souza Wayner de, Queiroz Dulciene, Cordeiro Francisco, Silva Norma Lucena

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