[1] Mahidol Univ, Fac Med Siriraj Hosp, Div Resp Dis & TB, Dept Med, Bangkok, Thailand
[2] Fdn Policlin Univ AGemelli IRCCS, Dept Emergency Intens Care Med & Anesthesia, Rome, Italy
[3] Univ Cattolica Sacro Cuore, Ist Anestesiol & Rianimaz, Rome, Italy
[4] St Michaels Hosp, Li Ka Shing Knowledge Inst, Unity Hlth Toronto, Keenan Res Ctr, Toronto, ON, Canada
[5] Univ Toronto, Interdept Div Crit Care Med, Toronto, ON, Canada