1. Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, Korea
2. Department of Critical Care Medicine, Seoul National University Boramae Medical Center, Seoul, Korea
3. Seoul National University Kidney Research Institute, Seoul, Korea
4. Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
5. Department of Internal Medicine, Chung-Ang University Hospital, Seoul, Korea
6. Department of Internal Medicine, Dongguk University Ilsan Hospital, Goyang, Gyeonggido, Korea
7. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
8. Department of Otorhinolaryngology, Seoul National University Boramae Medical Center, Seoul, Korea
9. Department of Otorhinolaryngology, Gyeongsang National University Hospital, Changwon, Korea