1. Intensive Care Unit, Hospital Universitario de Canarias, Santa Cruz de Tenerife, Spain
2. Intensive Care Unit, Hospital Universitario Nuestra Señora Candelaria, Santa Cruz de Tenerife, Spain
3. Intensive Care Unit, Hospital General de La Palma, La Palma, Spain
4. Laboratory Department, Hospital Universitario de Canarias, Santa Cruz de Tenerife, Spain
5. Research Unit, Hospital Universitario de Canarias, Santa Cruz de Tenerife, Spain