1. Behavioral Sciences Laboratories, Veterans Affairs Medical Center Oklahoma City OK USA
2. Department of Psychiatry and Behavioral SciencesUniversity of Oklahoma Health Sciences Center Oklahoma City OK USA
3. Department of PsychiatryUniversity of Arkansas Medical Center Little Rock AK USA
4. Donald W. Reynolds Department of Geriatric MedicineUniversity of Oklahoma Health Sciences Center Oklahoma City OK USA
5. Cognitive Science Research CenterUniversity of Oklahoma Norman OK USA