Anxiety and depression symptoms in university students from public institutions of higher education in Brazil during the covid-19 pandemic: a multicenter study. SciELO Preprints, 2023. DOI: 10.1590/SciELOPreprints.6080. Disponível em: https://preprints.scielo.org/index.php/scielo/preprint/view/6080. Acesso em: 11 jul. 2026.