1. Department of Nuclear Medicine; Yonsei University College of Medicine, Gangnam Severance Hospital; Seoul 135-720 Korea
2. Department of Pharmacology; Brain Research Institute, Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine; Seoul 120-752 Korea
3. Global Radiopharmacy Molecular Imaging Technologies; GE Healthcare; Husbyborg 15024 Uppsala Sweden
4. Department of Molecular Imaging; Korea Institute of Radiological & Medical Sciences; Seoul 139-706 Korea
5. Swarthmore College; 500 College Avenue Swarthmore; PA 19081 USA