1. Department of Materials Science and Engineering; Kyoto University; Sakyo-ku; Kyoto; 606-8501; Japan
2. SR Center, Research Organization of Science and Technology; Ritsumeikan University; 1-1-1; Noji-Higashi; Kusatsu, Shiga; 525-8577; Japan
3. Forensic Science Laboratory, Kyoto Pref. Police H.Q.; Kamigyo-ku; Kyoto; 602-8501; Japan