1. Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, Building 10, Room B3C346, 10 Center Drive, Bethesda, MD 20892-1003, USA.
2. Eli Lilly and Co, Indianapolis, IN 46285, USA.
3. Eli Lilly and Co, Windlesham GU20 6PH, UK.
4. Lilly, S. A. Avenida de la Industria 30, 28108 Alcobendas, Madrid, Spain.
5. Department of Perioperative Medicine, Clinical Center, National Institutes of Health, 10 Center Drive, Bethesda, MD 20892-1510, USA.