1. Division of Nephrology, Department of Medicine, Tri-Service General Hospital, National Defense Medical Center, No. 325, Section 2, Cheng-Kung Road, Neihu, Taipei 114, Taiwan
2. Graduate Institute of Medical Science, National Defense Medical Center, Taipei 114, Taiwan
3. Division of Neurology, Department of Medicine, Taoyuan General Hospital, Ministry of Health and Welfare, Taoyuan 330, Taiwan
4. Division of Nephrology, Department of Medicine, Taipei Medical University-Shuang Ho Hospital, Ministry of Health and Welfare, New Taipei City 235, Taiwan
5. Graduate Institute of Clinical Medical, Taipei Medical University, Taipei 110, Taiwan
6. Graduate Institute of Microbiology and Immunology, National Defense Medical Center, Taipei 114, Taiwan