[1] Johns Hopkins Univ, Sch Hyg & Publ Hlth, Dept Hlth Policy & Management, Baltimore, MD 21205 USA
[2] APACHE Med Syst Inc, Mclean, VA USA
[3] Brown Univ, Ctr Gerontol & Hlth Care Res, Providence, RI 02912 USA
[4] George Washington Univ, Med Ctr, Ctr Improve Care Dying, Washington, DC 20037 USA
[5] Covance Hlth Econ & Outcomes Serv Inc, Washington, DC USA
[6] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[7] Case Western Reserve Univ, Metrohlth Med Ctr, NE Ohio Reg Spinal Cord Injury Syst, Cleveland, OH USA
[8] Univ Calif Los Angeles, Los Angeles, CA 90024 USA
[9] Beth Israel Deaconess Med Ctr, Boston, MA USA
[10] Univ Tennessee, Coll Med, Chattanooga, TN USA
[11] Cleveland MetroHealth Med Ctr, Div Pulm Dis & Crit Care, Cleveland, OH USA
[12] Univ Virginia, Hlth Sci Ctr, Sch Med, Charlottesville, VA 22908 USA