2550-6722 2550-6722 S2550-67222017000300068 Ecuador 00 04 2017 00 04 2017 1 68 77

1989 1969 1991 2003 2003 1917 1972 1990 2006 1964 1 3-4 3-4 206-30 2010 2006 2003 2007 4 3 3 1-28 2005 1989 2010 2005 1993 1922 1984 1957 1966 NN 2009 1837 1995 2003