1816-8949
1816-8949
S1816-89492019000300117
10.18004/anales/2019.052.03.117-119
Paraguay
00
12
2019
00
12
2019
52
3
117
119
[
2013
5th ed
]
[
2016
9
3
3
233-8
]
[
2017
12
2
2
6-8
]
[
2008
65
215-22
]
[
2015
16
4
4
303-9
]
[
2014
168
7
7
595-6
]
[
2003
15
4
4
431-5
]
[
2014
42
30
30
656-63
]
[
2017
4
2
2
54-64
]
[
2018
]
[
2015
25
9
9
666-70
]
[
2012
22
2
2
126-30
]
[
2004
164
1405-12
]
[
2012
38
1523-31
]