[1] King Saud bin Abdulaziz Univ Hlth Sci, King Abdullah Int Med Res Ctr, Coll Med, Riyadh, Saudi Arabia
[2] Minist Natl Guard Hlth Affairs, Dept Intens Care, Riyadh, Saudi Arabia
[3] King Saud bin Abdulaziz Univ Hlth Sci, King Abdullah Int Med Res Ctr, Res Off, Minist Natl Guard Hlth Affairs, Riyadh, Saudi Arabia
[4] King Saud bin Abdulaziz Univ Hlth Sci, King Abdullah Int Med Res Ctr, Coll Med, Jeddah, Saudi Arabia
[5] Minist Natl Guard Hlth Affairs, Dept Intens Care, Jeddah, Saudi Arabia
[6] Prince Sultan Mil Med City, Dept Intens Care Serv, Riyadh, Saudi Arabia
[7] King Abdulaziz Univ, Fac Med, Dept Anesthesia & Crit Care, Jeddah, Saudi Arabia
[8] Alfaisal Univ, Coll Med, Riyadh, Saudi Arabia
[9] Dr Sulaiman Al Habib Grp Hosp, Dept Intens Care, Riyadh, Saudi Arabia
[10] King Fahad Armed Forces Hosp, Dept Med, Div Infect Dis, Jeddah, Saudi Arabia
[11] King Saud Med City, Dept Intens Care, Riyadh, Saudi Arabia
[12] Tanta Univ Hosp, Dept Anesthesiol & Intens Care, Tanta, Egypt
[13] King Faisal Specialist Hosp & Res Ctr, Dept Med, Jeddah, Saudi Arabia
[14] King Fahad Med City, Dept Crit Care Med, Riyadh, Saudi Arabia
[15] Al Noor Specialist Hosp, Dept Intens Care, Mecca, Saudi Arabia
[16] King Saud Univ, Dept Crit Care Med, Riyadh, Saudi Arabia
[17] King Faisal Specialist Hosp & Res Ctr, Riyadh, Saudi Arabia
[18] Minist Natl Guard Hlth Affairs, Dept Intens Care, Al Hasa, Saudi Arabia
[19] King Abdulaziz Univ, Dept Family & Community Med, Jeddah, Saudi Arabia
[20] King Fahad Cent Hosp, Dept Intens Care, Jeddah, Saudi Arabia
[21] Ohoud Hosp, King Fahad Hosp, Dept Crit Care, Al Madinah Al Monawarah, Saudi Arabia
[22] King Saud bin Abdulaziz Univ Hlth Sci, King Abdullah Int Med Res Ctr, Minist Natl Guard Hlth Affairs, Dept Biostat & Bioinformat, Riyadh, Saudi Arabia
[23] King Saud bin Abdulaziz Univ Hlth Sci, King Abdullah Int Med Res Ctr, POB 22490, Riyadh 11426, Saudi Arabia
[24] Univ Toronto, Inst Hlth Policy Management & Evaluat, Toronto, ON, Canada
[25] Sunnybrook Med Ctr, Dept Crit Care Med, Toronto, ON, Canada
[26] Sunnybrook Med Ctr, Dept Med, Toronto, ON, Canada
[27] Minist Natl Guard Hlth Affairs, Dept Infect Prevent & Control, Riyadh, Saudi Arabia
[28] Univ Oxford, Infect Dis Data Observ, Int Severe Acute Resp & Emerging Infect Consortiu, Oxford, England
[29] Univ Virginia, Sch Med, Dept Med, Int Severe Acute Resp & Emerging Infect Consortiu, Charlottesville, VA 22908 USA
[30] Univ Western Ontario, Dept Med, Div Infect Dis, London, ON, Canada
[31] King Saud bin Abdulaziz Univ Hlth Sci, King Abdullah Int Med Res Ctr, Al Hasa, Saudi Arabia