1. Preventive Medicine Service, Dr. Balmis General University Hospital, 03010 Alicante, Spain
2. Epidemiology Unit, Preventive Medicine Service, Dr. Balmis General University Hospital, Alicante Institute for Health and Biomedical Research (ISABIAL), 03010 Alicante, Spain
3. Medical Intensive Care Unit, Dr. Balmis General University Hospital, Alicante Institute for Health and Biomedical Research (ISABIAL), 03010 Alicante, Spain
4. Anesthesiology Service and Surgical Intensive Care Unit, Dr. Balmis General University Hospital, Alicante Institute for Health and Biomedical Research (ISABIAL), 03010 Alicante, Spain
5. Public Health Research Group, University of Alicante, San Vicente de Raspeig, 03690 Alicante, Spain
6. Biomedical Research Networking Center (CIBERESP), 28029 Madrid, Spain