Ran-hui Cha, MD, PhD* *Department of Internal Medicine, National Medical Center, 245, Eulji-ro, Jung-gu, Seoul, 100-799, Republic of Korea Shin Wook Kang, MD, PhD § §Department of Internal Medicine, Yonsei University College of Medicine, 50-1, Yonsei-ro, Seodaemun-gu, Seoul, 120-752, Republic of Korea Cheol Whee Park, MD, PhD † †Department of Internal Medicine, Seoul St. Mary's Hospital, The Catholic University of Korea, 222, Banpo- daero, Seocho-gu, Seoul, 137-701, Republic of Korea Dae Ryong Cha, MD, PhD ‡ ‡Department of Internal Medicine, Korea University Ansan- Hospital, Korea University, 123, Jeokgum-ro, Danwon-gu, Ansan, Gyeonggi-do, 425-707, Republic of Korea Ki Young Na, MD, PhD **,¶ **Department of Internal Medicine, Seoul National University Bundang Hopsital, 82, Gumi-ro, 173 Bun-gil, Bundang-gu, Gyeonggi-do, 463-707, Republic of Korea, ¶Department of Internal Medicine, Seoul National University College of Medicine, 101, Daehak-ro, Jongno- gu, Seoul, 110-799, Republic of Korea Sung Gyun Kim, MD, PhD ¥ ¥Department of Internal Medicine, Hallym University Sacred Heart Hospital, 22, Gwanpyeong-ro, 170 Beon-gil, Dongan-gu, Anyang, Gyeonggi-do, 431-796, Republic of Korea Sun Ae Yoon, MD, PhD *** ***Department of Internal Medicine, Uijeongbu St. Mary's Hospital, The Catholic University of Korea, 271, Cheonbo- ro, Uijeongbu, Gyeonggi-do, 480-717, Republic of Korea Sang Youb Han, MD, PhD¡¡ ¡¡Department of Internal Medicine, Inje University Ilsan- Paik Hospital, 170, Juhwa-ro, Ilsanseo-gu, Goyang, Gyeonggi-do, 411-706, Republic of Korea Jae Hyun Chang, MD, PhD ∫ ∫Department of Internal Medicine, Gachon University Gil Medical Center, Gachon University of Medicine and Science, 21, 774 Beon-gil, Namdong-daero, Namdong-gu, Incheon, 405-760, Republic of Korea Sue K. Park, MD, PhD #,¢,$ #Department of Preventive Medicine, Seoul National University College of Medicine, 101, Daehak-ro, Jongno- gu, Seoul, 110-799, Republic of Korea, ¢Department of Medical Science, Seoul National University Graduate School, 101, Daehak- ro, Jongno-gu, Seoul, 110- 799, Republic of Korea, $Cancer Research Institute, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul, 110-799, Republic of Korea Chun Soo Lim, MD, PhD ¶, ∫∫ ¶Department of Internal Medicine, Seoul National University College of Medicine, 101, Daehak-ro, Jongno- gu, Seoul, 110-799, Republic of Korea, ∫∫Department of Internal Medicine, Seoul National University Boramae Medical Center, 20, Boramae-ro, 5-gil, Dongjak-gu, Seoul, 156-707, Republic of Korea Yon Su Kim, MD, PhD ¶, Φ ¶Department of Internal Medicine, Seoul National University College of Medicine, 101, Daehak-ro, Jongno- gu, Seoul, 110-799, Republic of Korea, ΦKidney Research Institute, Seoul National University, 101, Daehak-ro, Jongno-gu, Seoul, 110-799, Republic of Korea