1. Intensive Care Unit, Medicine Department, University of Cádiz, University Hospital of Jerez, INIBiCA, 11407 Jerez, Spain
2. Department of Statistical and Operational Research, PAIDI Group CTS553, University of Cádiz, 11510 Cádiz, Spain
3. Microbiology Department, University Hospital of Jerez, 11407 Jerez, Spain
4. Medicine Faculty of Cádiz, University of Cádiz, 11510 Cádiz, Spain