[1] ENRM Vet Affairs Med Ctr, Ctr Healthcare Org & Implementat Res, Bedford, MA USA
[2] Boston Univ, Sch Publ Hlth, Hlth Outcomes Unit, Boston, MA 02118 USA
[3] Boston Univ, Sch Publ Hlth, Ctr Assessment Pharmaceut Practices CAPP Est 2000, Dept Hlth Law Policy & Management, Boston, MA 02118 USA
[4] Boston VA Hlth Care Syst, Emergency Serv, West Roxbury, MA USA
[5] Harvard Med Sch, Boston, MA 02115 USA
[6] Spaulding Rehabil Hosp, Dept Phys Med & Rehabil, Boston, MA USA