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Ulloa, Catalina, Alfonso Pereira Céspedes, Carolina Soley Gutiérrez, Nurith Porat, Arturo Abdelnour Vásquez, Ron Dagan, και Adriano Arguedas Mohs. Streptococcus Pneumoniae Upper Respiratory Carriage in Costa Rican Children With Otitis Media Before the Introduction of the Heptavalent Conjugated Vaccine in the National Immunization Program. 2013.

Ulloa, Catalina, et al. Streptococcus Pneumoniae Upper Respiratory Carriage in Costa Rican Children With Otitis Media Before the Introduction of the Heptavalent Conjugated Vaccine in the National Immunization Program. 2013.