1. Endocrine and Metabolic Disease Research Center, School of Medicine, University of Zulia, Maracaibo, Venezuela
2. Pulmonary and Critical Care Medicine Department, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, United States
3. Universidad Catolica de Cuenca. Provincia Azuay, Cuenca, Ecuador
4. Universidad Simon Bolívar, Facultad de Ciencias de la Salud, Barranquilla, Colombia