[1] Univ Freiburg, Sch Med, Dept Psychiat & Psychotherapy, D-79104 Freiburg, Germany
[2] Univ Freiburg, Sch Med, PET Grp, Dept Nucl Med, D-79106 Freiburg, Germany
[3] Atlanta VAMC, Decatur, GA USA
[4] Emory Univ, Sch Med, Dept Psychiat, Atlanta, GA 30322 USA
[5] Emory Univ, Sch Med, Dept Behav Sci, Atlanta, GA 30322 USA
[6] Emory Univ, Sch Med, Dept Radiol, Atlanta, GA 30322 USA
[7] Emory Univ, Sch Med, Ctr Positron Emiss Tomog, Atlanta, GA 30322 USA
[8] Univ Hosp Ulm, Dept Psychiat, D-89075 Ulm, Germany