2393-6606 2393-6606 S2393-66062020000200255 10.22235/ech.v9i2.2140 Brazil 00 12 2020 00 12 2020 9 2 255 256 2015 4 2 2 33-9 2019 72 ^s3 ^s3 3 290-6 2019 05 05-28 2019 28 1 1 250-61