Intensive Olfactory Training in Post-COVID Patients: A Randomized Multicenter Clinical Trial. SciELO Preprints, 2022. DOI: 10.1590/SciELOPreprints.3301. Disponível em: https://preprints.scielo.org/index.php/scielo/preprint/view/3301. Acesso em: 11 jun. 2026.