1816-8949
1816-8949
S1816-89492020000200047
10.18004/anales/2020.053.02.47
Venezuela
Paraguay
Paraguay
00
08
2020
00
08
2020
53
2
47
52
[
2015
4
13
13
50-1
]
[
2014
6
1
1
98-113
]
[
2008
25
3
3
325-9
]
[
2013
9
3
3
]
[
2017
17
4
4
]
[
2008
25
4
4
448
]
[
2015
4
13
13
42-9
]
[
2014
14
10
10
]
[
2017
18
1
1
78-9
]
[
2017
18
1
1
79
]
[
2010
118
1
1
69-72
]
[
2013
141
6
6
716-22
]
[
2016
5
18
18
115-20
]
[
2015
5
2
2
56-61
]
[
2009
14
1
1
27-34
]
[
2017
18
3
3
167-73
]
[
2017
18
3
3
154-9
]
[
2015
18
4
4
293-8
]