1. Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.
2. Institute of Allergy and Clinical Immunology, Seoul National University Medical Research Center, Seoul, Korea.
3. Department of Internal Medicine, Dong-A University College of Medicine, Busan, Korea.
4. Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea.
5. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
6. Department of Internal Medicine, Kyungpook National University School of Medicine, Daegu, Korea.
7. Department of Internal Medicine, Ewha Womans University College of Medicine, Seoul, Korea.
8. Department of Internal Medicine, Dongguk University Ilsan Hospital, Goyang, Korea.
9. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
10. Department of Internal Medicine, Pusan National University College of Medicine, Busan, Korea.
11. Department of Pharmacology, The Catholic University of Korea College of Medicine, Seoul, Korea.
12. Department of Internal Medicine, Inje University Busan Paik Hospital, Busan, Korea.
13. Department of Internal Medicine, Chonbuk National University Medical School, Jeonju, Korea.
14. Department of Internal Medicine, Chosun University Hospital, Gwangju, Korea.
15. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea.
16. Department of Internal Medicine, Keimyung University Dongsan Medical Center, Daegu, Korea.
17. Department of Internal Medicine, Inha University School of Medicine, Incheon, Korea.
18. Department of Internal Medicine, SMG-SNU Boramae Medical Center, Seoul, Korea.
19. Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea.
20. Department of Dermatology, Kangdong Sacred Heart Hospital, Seoul, Korea.
21. Department of Internal Medicine, Hallym University Sacred Heart Hospital, Anyang, Korea.
22. Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
23. Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
24. Department of Internal Medicine, Dankook University College of Medicine, Cheonan, Korea.
25. Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea.
26. Department of Internal Medicine, Inje University Haeundae Paik Hospital, Busan, Korea.
27. Department of Internal Medicine, Gyeongsang National University School of Medicine, Jinju, Korea.
28. Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, Korea.