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