1. Laboratory of Engineered Materials for Biomedical Applications, Department of Materials Science and Engineering, National Cheng Kung University, 1 University Road, Tainan 701, Taiwan
2. Division of Nephrology, Department of Internal Medicine, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, No.1, University Road, Tainan City, 701, Taiwan
3. Center for Measurement Standards, Industrial Technology Research Institute, No. 321, Kuang Fu Road, Section 2, Hsinchu 300, Taiwan
4. Center for Clinical Medicine Research, College of Medicine, National Cheng Kung University, No.1, University Road, Tainan City, 701, Taiwan