1. Division of Health Sciences, Graduate School of Medicine; Osaka University; Suita; Osaka; 565-0871; Japan
2. Molecular Imaging Center; National Institute of Radiological Sciences; 4-9-1 Anagawa, Inage-ku; Chiba; 263-8555; Japan
3. Department of Molecular Imaging and Radiotherapy, Graduate School of Pharmaceutical Sciences; Chiba University; 1-8-1 Inohana, Chuo-ku; Chiba; 260-8675; Japan