[1] Univ Pittsburgh, Sch Med, Dept Crit Care Med, Pittsburgh, PA USA
[2] Univ Washington, Sch Med, Div Pulm & Crit Care Med, Seattle, WA 98195 USA
[3] US Dept Vet Affairs, Hlth Serv Res & Dev, Ctr Innovat Vet Ctr & Value Driven Care, Seattle, WA USA
[4] Prima CARE, Div Pulm & Crit Med, Fall River, MA USA
[5] Univ Michigan, Sch Med, Div Pulm & Crit Care Med, Ann Arbor, MI 48109 USA
[6] Northwestern Univ, Feinberg Sch Med, Dept Pediat, Div Pulm Med, Chicago, IL 60611 USA
[7] Northwestern Univ, Feinberg Sch Med, Div Pulm & Crit Care Med, Chicago, IL 60611 USA
[8] Yale Univ, Sch Med, Sect Pulm Crit Care & Sleep Med, New Haven, CT USA
[9] Univ Texas Hlth Sci Ctr Houston, Div Crit Care Pulm & Sleep Med, Houston, TX 77030 USA