[1] VA Boston Healthcare Syst, Med, West Roxbury, MA USA
[2] Yale Univ, Sch Med, New Haven, CT USA
[3] Harvard Med Sch, Boston, MA USA
[4] Duke Med, Med, Durham, NC USA
[5] Iowa City VAMC, Internal Med, Iowa City, IA USA
[6] VA Palo Alto Hlth Care Syst, Internal Med, Palo Alto, CA USA
[7] VA Pittsburgh Healthcare Syst, Internal Med, Pittsburgh, PA USA
[8] Univ Utah, Internal Med, Salt Lake City, UT USA
[9] VA Puget Sound HCS, Med, Seattle, WA USA
[10] Univ Washington, SOM, Seattle, WA USA
[11] Washington DC VA Med Ctr, Med Serv, Washington, DC USA
[12] Boise VA Med Ctr, Med, Boise, ID USA
[13] Jesse Brown VA Chicago Healthcare Syst, Chicago, IL USA
[14] VA Eastern Colorado Hlth Care Syst, Aurora, CO USA
[15] Southeast Louisiana Vet Hlth Care Syst, New Orleans, LA USA
[16] VA Nebraska Western Iowa Hlth Care Syst, Omaha, NE USA
[17] Portland VA Med Ctr, Portland, OR USA
[18] VA Salt Lake City Hlth Care Syst, Salt Lake City, UT USA
[19] VA San Diego Healthcare Syst, San Diego, CA USA
[20] White River Junct VA Med Ctr, White River Jct, VT USA
[21] VA Connecticut Healthcare Syst, West Haven, CT USA
[22] VA Med Ctr Atlanta, Decatur, GA USA
[23] Durham VA Med Ctr, Durham, NC USA
[24] Kansas City VA Med Ctr, Kansas City, MO USA