Efficacy of bovine brucellosis vaccines: Conceptions, challenges and meta‐analysis. Response to the Letter to the Editor concerning "Efficacy of Brucella abortus S19 and RB51 vaccine strains: A systematic review and meta‐analysis" by Blasco et al (Transbound Emerg Dis; 2021: https://doi.org/10.1111/tbed.14259). Issue 4 (10th January 2022) - Dorneles, Elaine Maria Seles; Lage, Andrey Pereira; Bueno Filho, Júlio Silvio de Sousa; Godfroid, Jacques; Pereira, Carine Rodrigues