1. Trend Research Centre, Asia University, Taichung, Taiwan
2. Department of Nephrology, Szent Margit Kórhaz, Budapest, Hungary
3. Medicine Service, Ralph H. Johnson VA Medical Center, Charleston, SC, USA
4. Department of Medicine, Division of Nephrology, Mayo Clinic, Rochester, MN, USA
5. Department of Medicine, Division of Nephrology, Medical University of South Carolina, Charleston, SC, USA