1. Department of Intensive Care Medicine, Multidisciplinary Intensive Care Research Organization, St James’s Hospital, Dublin, Ireland
2. Hospital Clinic, IDIBAPS, Universidad De Barcelona, CIBERES, Barcelona, Spain
3. Dept of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, University of Connecticut School of Medicine, Farmington, CT, USA
4. Division of Infectious Diseases, Department of Internal Medicine, University of Nebraska Medical Center, Omaha, Nebraska, USA
5. Infectious Diseases, Department of Diagnostic and Public Health, University of Verona, Verona Italy