1. Department of Internal Medicine School of Medicine Kyungpook National University Daegu South Korea
2. Department of Statistics Kyungpook National University Daegu South Korea
3. Division of Nephrology Department of Internal Medicine Kyung Hee University Seoul South Korea
4. Division of Nephrology Department of Internal Medicine CHA Bundang Medical Center CHA University Seongnam South Korea
5. Department of Internal Medicine Seoul National University College of Medicine Seoul South Korea
6. Division of Nephrology Department of Internal Medicine Yonsei University College of Medicine Seoul South Korea
7. Department of Surgery Yonsei University College of Medicine Seoul South Korea