2236-3459 2236-3459 S2236-34592018000300001 10.1590/2236-3459/85695 Brazil 00 09 2018 00 09 2018 22 56 1 6 2007 2017 5 2011 101-9 1989 2007 2002 2014 SCIELO 2018 22 54 54 01-7