[1] Stanford Univ, Dept Psychiat & Behav Sci, Stanford, CA 94304 USA
[2] Stanford Univ, Stanford Neurosci Inst, Stanford, CA 94304 USA
[3] Vet Affairs Palo Alto Healthcare Syst, Palo Alto, CA 94304 USA
[4] Sierra Pacific Mental Illness,Res,Educ & Clin Ctr, Palo Alto, CA 94304 USA
[5] Univ Med Ctr Hamburg Eppendorf, Dept Syst Neurosci, D-20246 Hamburg, Germany
[6] Stanford Univ, Dept Psychol, Stanford, CA 94305 USA