Factors associated with mortality among elderly people in the COVID-19 pandemic (SARS-CoV-2): a systematic review and meta-analysis - Alves, Vicente Paulo; Casemiro, Francine Golghetto; Araujo, Bruno Gedeon de; Lima, Marcos André de Souza; Oliveira, Rayssa Silva de; Fernandes, Fernanda Tamires de Souza; Gomes, Ana Vitória Campos; Gregori, Dario (International Journal of Environmental Research and Public Health, 2021)