[1] Univ Florida, Dept Epidemiol & Biostat, Gainesville, FL 32610 USA
[2] Univ Florida, Dept Med, Gainesville, FL 32610 USA
[3] Pittsburgh VA Healthcare Syst, Pittsburgh, PA USA
[4] Boston Univ, Boston, MA 02215 USA
[5] Yale Univ, New Haven, CT USA
[6] Baylor Coll Med, Houston, TX 77030 USA
[7] Michael E DeBakey VA Med Ctr, Houston, TX USA
[8] Univ Pittsburgh, Pittsburgh, PA USA
[9] George Washington Univ, Washington, DC USA
[10] Washington DC VAMC, Washington, DC USA
[11] NYU, Sch Med, New York, NY USA
[12] VA Connecticut Healthcare Syst, West Haven, CT USA
[13] Rutgers State Univ, New Brunswick, NJ 08903 USA
[14] Univ Maryland, Baltimore, MD 21201 USA
[15] Baltimore VA, Baltimore, MD USA