1. Division of Chemical Engineering, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama-Cho, Toyonaka, Osaka 560-8531, Japan
2. Medical Engineering Laboratory, Department of Mechanical Engineering, Faculty of Engineering, Osaka Sangyo University, Daito, Osaka 574-8530, Japan
3. Biodesign Division, Department of Academia-Government-Industry Collaboration, Office of Research and Academia-Government-Community Collaboration, Hiroshima University, Hiroshima, Hiroshima 734-8551, Japan