1. Northeastern University,Software College,Shenyang,China,110819
2. Rikkyo University,Graduate School of Artificial Intelligence and Science,Tokyo,Japan,1718501
3. The First Affiliated Hospital of China Medical University,Department of Nuclear Medicine,Shenyang,China,110001
4. University of Aizu,Computer Science Division,Aizu-Wakamatsu,Japan,965-8580