1 Medical Emergency Department, Ibn Sina University Hospital, Rabat, Morocco.
2 Laboratory of Biostatistics, Clinical and Epidemiological Research, Medical School, Mohamed V University in Rabat, Rabat, Morocco.
3 Division of Respiratory and Critical Care Medicine, University Medicine Cluster, National University Hospital, National University Health System, Singapore, Republic of Singapore.
4 Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Republic of Singapore.
5 Intensive Care Department, College of Medicine-Riyadh, King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia. [email protected].