1390-4299
1390-4299
S1390-42992018000100058
10.17141/urvio.22.2018.3157
Ecuador
00
06
2018
00
06
2018
22
58
69
[
2004
4
7
7
388-413
]
[
2005
2
11
11
171-201
]
[
2011
]
[
2002
1
27
27
63-93
]
[
2007
313-26
]
[
1997
2
23
23
241-50
]
[
1998
]
[
2016
6
47
47
541-58
]
[
1981
10
10
126-55
]
[
2006
1
50
50
119-44
]
[
2010
3
31
31
357-91
]
[
2011
4-5
42
42
427-39
]
[
2000
1
3
3
55-75
]
[
2005
2
36
36
]
[
2008
59-72
]
[
2007
4
19
19
463-88
]
[
2015
]
[
2011
4-5
42
42
315-28
]
[
2012
3
43
43
249-66
]
[
2016
3
37
37
487-506
]
[
2002
3
104
104
715-22
]
[
1988
]
[
2009
2
18
18
183-213
]
[
2008
1
14
14
65-99
]
[
1998
46-86
]
[
2003
]
[
2007
]
[
1999
]