[1] Univ Arkansas Med Sci, Dept Med, 4300 W 7th St, Little Rock, AR 72205 USA
[2] Cent Arkansas Vet Healthcare Syst, Pulm & Crit Care Med Sect, Little Rock, AR USA
[3] Univ Arkansas Med Sci, Dept Psychiat, Little Rock, AR USA
[4] Cent Arkansas Vet Healthcare Syst, VA Ctr Mental Healthcare & Outcomes Res, North Little Rock, AR USA
[5] Cent Arkansas Vet Healthcare Syst, Behav Hlth Qual Enhancement Res Initiat, North Little Rock, AR USA