Methods to evaluate COVID-19 vaccine effectiveness, with an emphasis on quasi-experimental approaches. - Pescarini JM; Teixeira CSS; Cruz EP; Ortelan N; Pinto PFPS; Ferreira AJF; Alves FJO; Pinto Junior EP; Falcão IR; Rocha ADS; Silva NBD; Ortiz RF; et al. (Ciencia & saude coletiva, 2021)