[1] Hallym Univ, Sacred Heart Hosp, Div Pulm Allergy & Crit Care Med, Anyang 431070, South Korea
[2] Seegene Med Fdn, Seoul, South Korea
[3] Soonchunhyang Univ Hosp, Div Pulm & Crit Care Med, Cheonan, South Korea
[4] Yeungnam Univ, Med Ctr, Div Pulm Allergy & Crit Care Med, Taegu, South Korea
[5] Kangdong Sacred Heart Hosp, Div Pulm Allergy & Crit Care Med, Seoul, South Korea
[6] Chuncheon Sacred Heart Hosp, Div Pulm Allergy & Crit Care Med, Chunchon, South Korea
[7] Konkuk Univ Hosp, Div Pulm Allergy & Crit Care Med, Seoul, South Korea
[8] Wonkwnag Univ, Sanbon Hosp, Div Pulm Allergy & Crit Care Med, Gunpo, South Korea
[9] Dankook Univ Hosp, Div Pulm Allergy & Crit Care Med, Cheonan, South Korea
[10] Inha Univ Hosp, Div Pulm Allergy & Crit Care Med, Inchon, South Korea
[11] Gwangju Christian Hosp, Div Pulm Med, Kwangju, South Korea
[12] Dong A Univ Hosp, Dept Allergy, Pusan, South Korea
[13] Onnuri Clin Internal Med, Jeonju, South Korea
[14] Rapha Clin Otolaryngol, Anyang, South Korea
[15] Cheongchun Clin Internal Med, Taegu, South Korea
[16] Leejaemyeong Clin Internal Med, Anyang, South Korea
[17] Hanaro Clin Internal Med, Taejon, South Korea
[18] Hallym Clin Internal Med, Hongchon, South Korea