1 Department of Internal Medicine, University of South Carolina, School of Medicine, Columbia, SC, USA ; Department of Anesthesiology, Division of Critical Care Medicine, Keck School of Medicine, The University of Southern California, Los Angeles, CA, USA.
2 King Abdul-Aziz Cardiac Center, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia.
3 Department of Surgery, University of Manitoba, Z3053-409 Tache Avenue, Winnipeg, MB, Canada R2H 2A6.
4 Critical Care Medicine Department, Athens University School of Nursing, 516 Mesogeion Avenue, Agia Paraskevi, 15342 Athens, Greece.
5 Division of Critical Care Medicine, Department of Medicine, Jay B. Langner Critical Care Service Montefiore Medical Center, Albert Einstein College of Medicine, NY, USA.