1. Department of Oral Functional Prosthodontics, Faculty of Dental Medicine, Graduate school of Dental Medicine, Hokkaido University, Kita-13, Nishi-7, Sapporo 060-8586, Japan
2. Research Institute for Electronic Science, Hokkaido University, Kita-20, Nishi-10, Sapporo 001-0020, Japan
3. Graduate School of Environmental Science, Hokkaido University, Kita-10, Nishi-5, Sapporo 060-0810, Japan
4. Support Section for Education and Research, Faculty of Dental Medicine, Hokkaido University, Sapporo 060-8586, Japan
5. Nanomaterials Research Institute (NMRI), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
6. Meijo University, Graduate School of Science and Technology, 1-501, Shiogamaguchi, Tenpaku, Nagoya 468-8502, Japan