Table of Contents

Original Research

Page 7-20
Claudia Cennamo, Marco Di Fiore
Page 21-35
Ramón Corral H, Susana Arredondo, Jorge Almaral, José Gómez
Page 37-62
Edgar Muñoz, David Gómez
Page 63-80
Jorge Rufino, Iván Machado, Yosvany Dias
Page 81-94
Mario Campero
Page 95-106
Daniel Mauricio Ruiz Valencia, Maria Claudia Borrero Chaux, María Patricia León Neira, Hermes Ariel Vacca Gámez