LIU, Y. The Survey on vaccination and infection of middle school students after the full liberalization of COVID-19. Pacific International Journal, [S. l.], v. 6, n. 2, p. 125–130, 2023. DOI: 10.55014/pij.v6i2.368. Disponível em: https://rclss.com/pij/article/view/368. Acesso em: 21 nov. 2024.