1909-0455
1909-0455
S1909-04552018000200021
10.22507/pml.v13n2a3
Ecuador
Ecuador
Cuba
00
12
2018
00
12
2018
13
2
21
28
[
1982
]
[
2017
22
2
2
158-82
]
[
2017
2016
]
[
2017
142
81-90
]
[
2013
]
[
2005
2
]
[
2015
42
4
4
14-25
]
[
2009
]
[
2006
3
1
1
1
]
[
2001
192
1
1
73-8
]
[
2013
]
[
2017
244
5
5
]
[
2017
30
7
7
]
[
2017
187
807-19
]
[
2017
34
62-71
]
[
2017
36
36
145-78
]
[
1998
167-89
]
[
2002
74
1-4
1-4
13-23
]
[
2015
31
2
2
84-107
]
[
1995
4
]
[
1990
]
[
1959
]
[
2017
104
20-9
]
[
2017
114
1306-32
]
[
1977
5
17-32
]
[
2016
7
2
2
353-70
]
[
2015
2014
]
[
2017
159-71
]
[
2017
9
4
4
]
[
1987
2
1
1
80-93
]
[
2017
1-43
]
[
2013
8
3
3
3-14
]
[
2017
32
9
9
500-6
]
[
2015
45
2
2
106-17
]
[
2017
66
3
3
2462-73
]
[
2017
2017
]
[
2016
2015
]
[
2003
1
]
[
2014
2
2
5-8
]
[
2006
]
[
2010
35
1
1
1-8
]
[
1982
9
]