1. Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, USA
2. Departments of Radiology and Psychiatry and Behavioral Sciences, School of Medicine, Emory University, Atlanta, Georgia, USA
3. Morehouse School of Medicine, Atlanta, Georgia, USA
4. Morehouse School of Medicine, Atlanta, Georgia, USA; University of California–Riverside School of Medicine, Riverside, California, USA
5. Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, USA; University of California–Riverside School of Medicine, Riverside, California, USA
6. Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, USA. xzhang8@emory.edu