1. Critical Care Department King Saud Medical City Riyadh Saudi Arabia
2. Neurocritical Care Department King Saud Medical City Riyadh Saudi Arabia
3. Critical Care Department The University of Alberta, School of Medicine and Dentistry Edmonton Alberta Canada
4. Department of Medicine The Johns Hopkins University Hospital Baltimore Maryland USA
5. Department of Internal Medicine University of South Carolina, School of Medicine Columbia South Carolina USA
6. Critical Care Department, Keck School of Medicine University of Southern California Los Angeles California USA
7. Department of Emergency Medicine St. Francis Hospital Columbus Georgia USA