1. Department of Anesthesia and Intensive Care Medicine, Sapienza Università di Roma, Policlinico Umberto I, Rome, Italy
2. Division of Pulmonary, Allergy, and Critical Care Medicine, College of Physicians and Surgeons, Columbia University, New York, New York3New York–Presbyterian Hospital, New York, New York
3. Department of Intensive Care, Université Libre de Bruxelles, Brussels, Belgium