[1] NIMH, Mol Imaging Branch, Bethesda, MD 20892 USA
[2] Univ London Imperial Coll Sci Technol & Med, London, England
[3] GlaxoSmithKline Inc, London, England
[4] CEA, DSV, SHF, Orsay, France
[5] Univ Aarhus, Aarhus, Denmark
[6] Univ Oxford, London, England
[7] Univ Wisconsin, Madison, WI USA
[8] Univ Toronto, Toronto, ON, Canada
[9] Ctr Addict & Mental Hlth, Toronto, ON, Canada
[10] Univ Calif Los Angeles, Sch Med, Los Angeles, CA USA
[11] Columbia Univ, New York, NY USA
[12] Natl Cardiovasc Ctr, Res Inst, Suita, Osaka 565, Japan
[13] Tokyo Metropolitan Inst Gerontol, Tokyo, Japan
[14] Univ Michigan, Ann Arbor, MI 48109 USA
[15] Univ Copenhagen Hosp, Rigshosp, DK-2100 Copenhagen, Denmark
[16] Turku PET Ctr, Turku, Finland
[17] Vrije Univ Amsterdam Med Ctr, Amsterdam, Netherlands
[18] Brookhaven Natl Lab, Upton, NY 11973 USA
[19] Pfizer Global R&D, Groton, CT USA
[20] Washington Univ, Sch Med, St Louis, MO USA
[21] Indiana Univ Purdue Univ, Indianapolis, IN 46202 USA
[22] Univ Pittsburgh, Pittsburgh, PA USA
[23] Univ British Columbia, Vancouver, BC V5Z 1M9, Canada
[24] Emory Univ, Atlanta, GA 30322 USA
[25] Johns Hopkins Univ, Sch Med, Baltimore, MD USA
[26] Yale Univ, New Haven, CT USA
[27] Natl Inst Radiol Sci, Chiba 260, Japan