Acid pH increases SARS-CoV-2 infection and the risk of death by COVID-19 - Restrepo, Jeffersson Leandro Jimenez; Codo, Ana Campos; Sampaio, Vanderson de Souza; Oliveira, Antonio Edson Rocha; Ferreira, Lucas Kaoru Kobo; Davanzo, Gustavo Gastão; Monteiro, Lauar de Brito; Silva, João Victor Virgilio da; Borba, Mayla Gabriela Silva; Souza, Gabriela Fabiano de; Zini, Nathalia; Gandolfi, Flora de Andrade; et al. (Frontiers in Medicine, 2021)