1645-3794 1645-3794 S1645-37942019000200009 Portugal Mozambique USA 30 12 2019 30 12 2019 38 9 14 2000 21 1 1 59-73 1995 17 137-75 2018 2013 24 4 4 151-60 1998 9 3 3 51-65 1997 2015 1991 2 4 4 11-24 2006 2011 18 2 2 275-310 2019 2009 20 3 3 108-21