[1] Univ Minnesota Twin Cities, Div Epidemiol & Community Hlth, Minneapolis, MN USA
[2] Vet Affairs Med Ctr, Ctr Chron Dis Outcomes Res, Minneapolis, MN USA
[3] Univ Minnesota Twin Cities, Dept Med, Minneapolis, MN USA
[4] Univ Calif San Diego, Dept Psychiat, La Jolla, CA 92093 USA
[5] Calif Pacific Med Ctr, Res Inst, San Francisco, CA USA
[6] Harvard Univ, Dept Med, Boston, MA 02115 USA
[7] Harvard Univ, Div Sleep Med, Boston, MA 02115 USA