0034-7744
0034-7744
S0034-77442019000400784
10.15517/rbt.v67i4.34822
Cuba
Ecuador
00
09
2019
00
09
2019
67
4
784
809
[
1984
19
297-8
]
[
2008
76
1-13
]
[
2013
2
2
2
73-6
]
[
1988
11
252-62
]
[
1988
11
1
1
72-84
]
[
2006
79
91-108
]
[
1970
]
[
1994
19
409-16
]
[
1980
37
583-8
]
[
1997
20
1
1
138-42
]
[
1992
15
147-57
]
[
1990
102
84-98
]
[
2006
142-52
]
[
2000
]
[
1973
]
[
2004
85
7
7
1771-89
]
[
2004
75
3
3
266-80
]
[
1978
80
15-23
]
[
1979
101
191-210
]
[
1982
5
58-65
]
[
1969
62
736-8
]
[
1991
277-91
]
[
1996
]
[
1980
82
335-43
]
[
2008
137
298-313
]
[
1999
13
623-45
]
[
2007
]
[
1972
43
205-12
]
[
1998
106
163-9
]
[
2001
16
1
1
35-44
]
[
2006
66-93
]
[
2011
59
2
2
771-87
]
[
2015
501
49-56
]
[
2016
4
3
3
67-75
]
[
2017
40
2
2
221-45
]
[
2011
14
1
1
35-43
]
[
2006
]
[
2003
16
1
1
45-54
]
[
2002
204-10
]
[
2006
20
1-2
1-2
70-2
]
[
2008
22
1-2
1-2
75-7
]
[
1999
12
1
1
7-9
]
[
1980
68
225-52
]
[
1971
]
[
1970
82
458-60
]
[
2002
359-408
]
[
1966
100
916
916
611-7
]
[
1968
102
926
926
385-9
]
[
1993
48
35-47
]
[
1973
90
268-80
]
[
1989
12
24-9
]
[
2013
26
1-7
]
[
1994
571-84
]
[
1975
15
345-51
]
[
1971
42
49-53
]
[
2000
]
[
1999
,
130-40
]
[
1979
103
613-7
]
[
1973
90
821-6
]
[
2009
22
26-31
]
[
2014
3
1
1
22-42
]
[
1990
56
3
3
747-57
]
[
1996
46
9
9
655-64
]
[
1962
64
169-83
]
[
1977
129-205
]
[
1974
4-85
]
[
1993
21
31-9
]
[
1977
79
31-6
]
[
1986
49
2
2
65-79
]
[
1968
]
[
1995
97
141-53
]
[
2013
6
1
1
12-7
]
[
1967
42
1-4
]
[
1993
16
2
2
149-57
]
[
2004
77
3
3
502-21
]
[
2006
]
[
2000
]
[
1987
68
6
6
1760-72
]
[
2002
149
25-39
]
[
1986
9
2
2
236-42
]
[
2009
393
161-71
]
[
1987
57
111-28
]
[
2005
182
1
1
67-73
]
[
1977
58
514-26
]
[
1961
31
3
3
285-312
]
[
1969
103
934
934
589-603
]
[
1991
32
567-79
]
[
1986
36
101-13
]
[
1991
14
140-9
]
[
1969
17
320-2
]
[
1983
1-83
]
[
1984
15
155-61
]
[
1987
10
38-44
]
[
1979
]
[
1972
]
[
1972
43
43-55
]
[
1969
4
265-73
]
[
1973
11
193-206
]
[
1999
13
647-62
]
[
1958
75
1
1
89
]
[
2002
73
3
3
292-7
]
[
1983
]
[
1983
]
[
1993
]
[
1973
115
517-34
]
[
1977
42
5-10
]
[
1992
]
[
1978
27-34
]
[
1996
375-416
]
[
1994
72
1-2
1-2
75-114
]