Effectiveness of the vaccine against SARS-CoV-2 upon hospitalizations during the fourth epidemic wave in Queretaro, Mexico: Vaccination and hospitalization due to COVID-19. Acta Med Peru [Internet]. 2023 May 8 [cited 2024 Dec. 25];40(1). Available from: https://amp.cmp.org.pe/index.php/AMP/article/view/2476