1Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea
2Department of Allergy and Clinical Immunology, Ajou University School of Medicine, Suwon, Korea
3Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
4Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
5Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Korea
6Department of Allergy and Clinical Immunology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
7Department of Internal Medicine, Bucheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Bucheon, Korea
8Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
9Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
10Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Korea
11Division of Allergy, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
12Department of Internal Medicine, Chung-Ang University H.C.S. Hyundae Hospital, Namyangju, Korea