1. Faculty of Medical Sciences, University of Guayaquil, Babahoyo, Ecuador
2. Physiology and Respiratory Center Briones-Claudett, Guayaquil, Ecuador
3. Intensive Care Unit, Ecuadorian Institute of Social Security (IESS), Babahoyo, Ecuador
4. Intensive Care Unit, Omni Hospital, Guayaquil, Ecuador
5. Critical Care Department, Hospital de los Valles, Quito, Ecuador