1 Intensive Care Department, MC 1425, College of Medicine, King Saud bin Abdulaziz University for Health Sciences (KSAU-HS) and King Abdullah International Medical Research Center (KAIMRC), P.O. Box 22490, Riyadh, 11426, Kingdom of Saudi Arabia. arabi@ngha.med.sa.
2 Department of Intensive Care, Erasme University Hospital, Université Libre de Bruxelles, Brussels, Belgium.