1. Division of Nephrology, Department of Internal Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 807, Taiwan
2. Taiwan Instrument Research Institute, National Applied Research Laboratories, Hsinchu 300, Taiwan
3. Department of Information and Management, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
4. Department of Healthcare Administration and Medical Informatics, Kaohsiung Medical University, Kaohsiung 807, Taiwan
5. Department of Mathematical Sciences, National Chengchi University, Taipei 116, Taiwan
6. Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan
7. Institute of Population Health Sciences, National Health Research Institutes, Zhunan Town, Miaoli County 350, Taiwan