0003-2573 0003-2573 S0003-25732021000300601 10.31447/as00032573.2021240.09 Portugal 30 09 2021 30 09 2021 240 601 607 2003 2015 2 2007 V 19 19 145-84 1984 67-73 2006 13 2 2 173-204 1984 9-28