1. Intensive Care Unit, Hospital Universitario de Canarias, La Laguna Santa Cruz de Tenerife, Spain
2. Intensive Care Unit, Hospital Universitario Nuestra Señora de Candelaria, Santa Cruz de Tenerife, Spain
3. Laboratory Department, Hospital Universitario de Canarias, Santa Cruz de Tenerife, Spain
4. Intensive Care Unit, Hospital General La Palma, Spain
5. Intensive Care Unit, Hospital Universitario Dr. Negrín. CIBERES, Las Palmas de Gran Canaria, Spain
6. Intensive Care Unit, Hospital Insular, Las Palmas de Gran Canaria, Spain
7. Laboratory Department, Hospital Universitario de Canarias, La Laguna, Santa Cruz de Tenerife, Spain
8. Research Unit, Hospital Universitario de Canarias, La Laguna. Santa Cruz de Tenerife, Spain