1981-5271 1981-5271 S1981-52712019000200003 10.1590/1981-52712015v43n2RB20180editorial2 Brasil Brasil 00 04 2019 00 04 2019 43 2 3 4 1 18 9 9 2 11 3 3 579-90 3 38 1 1 26-33 4 4a 5