[1] Univ Uppsala, PET Ctr, S-75185 Uppsala, Sweden
[2] Univ Uppsala Hosp, Dept Psychiat, S-75017 Uppsala, Sweden
[3] Uppsala Univ, Vasteras Cent Hosp, Dept Psychiat Res, S-72189 Vasteras, Sweden
[4] Res Dev Corp Japan, Sub Femtomole Biorecognit Project, Tokyo, Japan