1. RAND, Boston, MA, USA
2. VA Boston Healthcare System, Boston, MA, USA
3. Harvard Medical School, Boston, MA, USA
4. Edith Nourse Rogers Memorial Veterans Hospital, Bedford, MA, USA
5. Boston University, Boston, MA, USA
6. Harvard T. H. Chan School of Public Health, Boston, MA, USA
7. Boston University School of Public Health, Boston, MA, USA