[1] Univ Calif Los Angeles, Sch Med, Dept Pharmacol, Los Angeles, CA 90024 USA
[2] Univ Calif Los Angeles, Sch Med, Dept Biomed Phys, Los Angeles, CA 90024 USA
[3] Univ Calif Los Angeles, Sch Med, Dept Biomath, Los Angeles, CA 90024 USA
[4] Parkinsons Inst, San Jose, CA USA