[1] VA Palo Alto Hlth Care Syst, Palo Alto, CA 94304 USA
[2] Stanford Univ, Sch Med, Stanford, CA 94305 USA
[3] Tufts Univ, Sch Med, Maine Med Ctr, Portland, ME USA
[4] Univ Calif San Francisco, Dept Physiol Nursing, San Francisco, CA USA
[5] Vanderbilt Univ, Med Ctr, VA Tennessee Valley Healthcare Syst, VA GRECC Geriatr Res Educ Clin Ctr, Nashville, TN USA
[6] McGill Univ, Ingram Sch Nursing, Montreal, PQ, Canada
[7] McGill Univ, Jewish Gen Hosp, Ctr Nursing Res, Lady Davis Inst, Montreal, PQ H3T 1E2, Canada
[8] Ohio State Univ, Coll Pharm, Columbus, OH 43210 USA
[9] Univ Texas Austin, Coll Pharm, Austin, TX 78712 USA
[10] Scripps Hlth, Scripps Clin Ctr, La Jolla, CA USA
[11] Tufts Univ Med, Dept Pharm Practice, Div Pulm Crit Care & Sleep Med, Special & Sci Staff,Northeastern Univ, Boston, MA USA
[12] Univ Chicago, Dept Med, Sect Pulm & Crit Care, Chicago, IL 60637 USA
[13] Univ Washington, Harborview Med Ctr, Dept Anesthesiol & Pain Med, Seattle, WA 98104 USA
[14] Univ Wisconsin, Dept Anesthesiol, Sch Med & Publ Hlth, Madison, WI USA
[15] Univ Wisconsin, Dept Internal Med, Sch Med & Publ Hlth, Madison, WI USA
[16] Univ Maryland, Ctr Shock Trauma, Div Trauma Crit Care Med, Baltimore, MD 21201 USA
[17] Univ Chicago, Dept Anesthesia & Crit Care, Chicago, IL 60637 USA
[18] Univ Cincinnati, Dept Surg, Div Trauma & Crit Care, Cincinnati, OH 45267 USA
[19] Univ Virginia, Sch Nursing, Charlottesville, VA 22903 USA
[20] Baylor Univ, Med Ctr, Dallas, TX USA
[21] Virginia Commonwealth Univ Heath Syst, Dept Internal Med, Richmond, VA USA
[22] Vanderbilt Univ, Med Ctr, Dept Allergy Pulm & Crit Care Med, Nashville, TN USA
[23] Univ Montreal, Montreal, PQ, Canada
[24] McMaster Univ, Hamilton, ON, Canada
[25] St Josephs Hosp, Dept Med, Hamilton, ON, Canada
[26] St Josephs Hosp, Dept Clin Epidemiol & Biostat, Hamilton, ON, Canada