1. Division of Nephrology, Department of Medicine, Taipei Medical University-Shuang Ho Hospital, Taipei Medical University, Taipei 235, Taiwan
2. Department of Medicine, Cardinal Tien Hospital, School of Medicine, Fu Jen Catholic University, Taipei 231, Taiwan
3. Division of Nephrology, Department of Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei 114, Taiwan
4. Graduate Institute of Microbiology and Immunology, National Defense Medical Center, Taipei 114, Taiwan