1679-4974 1679-4974 S1679-49742021000200001 10.1590/s1679-49742021000200001 Brazil 00 00 2021 00 00 2021 30 2 1 2021 372 6544 6544 821-6 2 2021 12 1 1 2349 3 2021 4 2021 5 2020 368 m769 6 2020