[1] Univ Calif San Diego, Dept Psychiat, Div Geriatr Psychiat, San Diego, CA 92093 USA
[2] Baylor Coll Med, Dept Med, Houston, TX 77030 USA
[3] Michael E DeBakey VA Med Ctr, Houston, TX 77030 USA
[4] Univ Texas Hlth Sci Ctr San Antonio, San Antonio, TX 78229 USA
[5] S Texas Vet Hlth Care Syst, San Antonio, TX 78229 USA