Seroprevalence and risk factors associated with Helicobacter pylori infection in blood donors in Salvador, Northeast-Brazil by Andre C. Lyra, Genoile Santana, Nelma Santana, Anibal Silvany-Neto, Emilia Magalhães, Eduardo M. Pereira, Ramiro Mascarenhas, Marcos C. Lyra, Andrea Veiga, Karina Ferreira, Schilioma Zaterka, Luiz G. Lyra

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