[1] Chung Ang Univ, Coll Med, Dept Internal Med, Seoul, South Korea
[2] Chungnam Natl Univ, Sejong Hosp, Dept Internal Med, Div Pulmonol & Allergy, Sejong, South Korea
[3] St Carollo Gen Hosp, Dept Internal Med, Sunchon, South Korea
[4] Kyung Hee Univ, Med Ctr, Dept Internal Med, Div Pulmonol & Allergy, Seoul, South Korea
[5] Gachon Univ, Gil Med Ctr, Dept Internal Med, Div Pulmonol & Allergy, Incheon, South Korea
[6] Yonsei Univ, Coll Med, Gangnam Severance Hosp, Dept Internal Med, Seoul, South Korea
[7] Chungbuk Natl Univ Hosp, Chungbuk Natl Coll Med, Dept Internal Med, Cheongju, South Korea
[8] Hallym Univ, Sacred Heart Hosp, Coll Med, Div Pulm Allergy & Crit Care Med, Anyang, South Korea
[9] Yonsei Univ, Coll Med, Dept Internal Med, Seoul, South Korea
[10] Yonsei Univ, Coll Med, Inst Allergy, Seoul, South Korea
[11] Seoul Natl Univ Hosp, Dept Pediat, Seoul, South Korea
[12] Seoul Natl Univ, Coll Med, Dept Pediat, Seoul, South Korea
[13] Seoul Natl Univ, Coll Med, Dept Dermatol, Seoul, South Korea
[14] Seoul Natl Univ, Bundang Hosp, Dept Internal Med, Seongnam, South Korea
[15] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Allergy & Clin Immunol, Seoul, South Korea
[16] Seoul Natl Univ, Med Res Ctr, Inst Allergy & Clin Immunol, Seoul, South Korea
[17] Seoul Natl Univ, Coll Med, Dept Internal Med, 20 Boramae Ro 5 Gil, Seoul 07061, South Korea