Mobile, R.Z. et al. 2022. SARS-CoV-2 in saliva, viremia and seroprevalence for COVID-19 surveillance at a single hematopoietic stem cell transplantation center: a prospective cohort study. Revista do Instituto de Medicina Tropical de São Paulo. 64, (Jun. 2022), e39. DOI:https://doi.org/10.1590/S1678-9946202264039 .