1990-8644 1990-8644 S1990-86442018000300229 Cuba 00 06 2018 00 06 2018 14 63 229 234

(199 8) (200 7) (199 6) 10-20 (199 9) (199 8) 18 (200 2) (197 9) (199 7) Bogotá, Colombia