1. Department of Molecular Probes and
2. Department of Biophysics, Molecular Imaging Center, National Institute of Radiological Sciences, Chiba 263-8555, Japan
3. Tokyo Nuclear Services Co., Ltd., Tokyo 110-0005, Japan
4. SHI Accelerator Service Ltd., Tokyo 141-0032, Japan
5. Division of Health Sciences, Graduate School of Medicine, Osaka University, Suita 565-0871, Japan