1. Department of Materials Science and Engineering, National Cheng Kung University, University Road No. 1, 70101 Tainan, Taiwan
2. Department of Mechanical Engineering, National Chung Cheng University, No. 168, Sec. 1, University Rd., Minhsiung, 62102 Chiayi, Taiwan
3. Department of Health Science and Technology, ETH Zürich, Universitätstrasse 2, 8092 Zürich, Switzerland