Authors: William A Calo; Rafael Quintana; Ivan Catoni; Yarí Valle; Julio J Alvarez; Wanda M Colón; Marla S Delgado; Mayra Estrella; Aida L González; María Kallis; Vivienne M Marrero; Lehida Meléndez; Aisha I Miranda; Karen Nieves; Lydiette Osorio; José M Rodríguez; Azalia Torres; Erick Suárez; Ana P Ortiz Journal: P R Health Sci J Date: 2009-06 Impact factor: 0.705