The effectiveness of COVID-19 vaccines in Latin America, 2021: a multicenter regional case–control studyResearch in context oleh Rebecca Kahn, Cara B. Janusz, Marcia C. Castro, Aline da Rocha Matos, Carla Domingues, Jamie Ponmattam, Gloria Rey-Benito, Cristiana M. Toscano, Lucia Helena de Oliveira, Analia Rearte, Ignacio Leandro Uriarte, Elsa Baumester, Maria Elena Borda, Miguel Diaz Cordoba, Juan Facundo Petrina, Ezequiel Consiglio, Carla Vizzotti, Tatiana Guimarães de Noronha, Maria Paula Gomes Mourão, Jeova Keny Baima Colares, Sonia Mara Raboni, Tazio Vanni, Lely Guzman, Adriana Regina Farias Pontes Lucena, Maria Elena Santolaya, Cinthya Urquidi, Claudia P. Cortes, Pedro Pablo Usedo Lopez, Rosana Benitez, Veronica Menares Latorre, Andrea Moller Roth, Iván Brstilo Cerda, Solange Santillana, Zohra Abaakouk, Angel Paternina Caicedo, Nelson Alvis Guzman, Juan Carlos Fernandez Mercado, Fernando de la Hoz Restrepo, David Santiago Quevedo, Sofia Rios Oliveros, Diane Moyano Romero