2477-9105 2477-9105 S2477-91052019000100056 10.47187/perf.v2i22.63 Ecuador 00 12 2019 00 12 2019 2 22 56 63

2002 141-80 1963 April April 80 1976 February February 87-90 1985 Four 29-109 1995 1997 2004 1977 75 2 2 78 1980