1 Intensive Care Department, Ministry of National Guard-Health Affairs, King Abdullah International Medical Research Center, College of Medicine, King Saud Bin Abdulaziz University for Health Sciences, King Abdulaziz Medical City, P.O. Box 22490, Riyadh, 11426, Saudi Arabia. yaseenarabi@yahoo.com.
2 Section of Pulmonary and Critical Care Medicine, Department of Medicine, University of Chicago, Chicago, IL, USA.
3 Department of Anesthesiology and Intensive Care Medicine, Università Cattolica del Sacro Cuore, Rome, Italy.
4 Anesthesia and Intensive Care, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy.