1 Drug Safety Monitoring Center, Seoul National University Hospital, Seoul, Korea.
2 Department of Internal Medicine, Ewha Womans University College of Medicine, Seoul, Korea.
3 Department of Neurology, Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea.
4 Department of Neurology, Seoul National University Hospital, Seoul, Korea.
5 Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
6 Department of Internal Medicine, Jeju National University Hospital, Jeju, Korea.
7 Department of Internal Medicine, Dong-A University College of Medicine, Busan, Korea.
8 Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea.
9 Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea.
10 Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea.
11 Department of Dermatology, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.
12 Department of Internal Medicine, Ajou University School of Medicine, Suwon, Korea.
13 Department of Internal Medicine, Keimyung University, Dongsan Medical Center, Daegu, Korea.
14 Department of Internal Medicine, SMG-SNU Boramae Medical Center, Seoul, Korea.
15 Department of Internal Medicine, Kyungpook National University School of Medicine, Daegu, Korea.
16 Department of Internal Medicine, Gyeongsang National University School of Medicine, Jinju, Korea.
17 Department of Internal Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea.
18 Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea.
19 Department of Internal medicine, KyungHee University Medical Center, Seoul, Korea.
20 Department of Immunology, Prince of Wales Hospital, Sydney, Australia.
21 Drug Safety Monitoring Center, Seoul National University Hospital, Seoul, Korea; Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea; Institute of Allergy and Clinical Immunology, Seoul National University Medical Research Center, Seoul, Korea. Electronic address: helenmed@snu.ac.kr.