1. Division of Infectious Diseases, Department of Internal Medicine and AIDS Research Institute, Yonsei University College of Medicine, Seoul, Korea.
2. Division of Nephrology, Department of Internal Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
3. Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.
4. Department of Nephrology, Sheikh Khalifa Specialty Hospital, Ras Al Khaimah, United Arab Emirates.