[1] VA Connecticut Healthcare Syst, Hlth Serv Res & Dev, West Haven, CT USA
[2] Yale Univ, Biostat, New Haven, CT USA
[3] US Dept Vet Affairs, Natl Ctr Homelessness Vet, Tampa, FL USA
[4] Walter Reed Natl Mil Med Ctr, Dept Behav Hlth, Bethesda, MD USA
[5] Univ Texas Hlth Sci Ctr Houston, Sch Publ Hlth, Houston, TX USA
[6] Harvard Med Sch, Dept Populat Med, Boston, MA 02115 USA
[7] Harvard Pilgrim Hlth Care Inst, Boston, MA 02215 USA