1560-4381 1560-4381 S1560-43812019000100270 Cuba Ecuador 00 03 2019 00 03 2019 23 1 270 274 1 2008 61 7 7 752-64 2 2014 9 1 1 71-81 3 2017 7 3 3 4 2018 3 4 4 280-7 5 2017 21 1 1 70-86