0376-7892 0376-7892 S0376-78922021000100001 10.4321/s0376-78922021000100001 Portugal 00 03 2021 00 03 2021 47 1 1 4 1 2005 156 72-87 2 1988 22 21-8 3 2020 4 240-5 4 2016 5 1933 39 6 1926