[1] Ewha Womans Univ, Coll Med, Dept Internal Med, Seoul, South Korea
[2] Konkuk Univ, Sch Med, Dept Internal Med, Seoul, South Korea
[3] Hallym Univ, Kandong Sacred Heart Hosp, Dept Internal Med, Div Pulm Allergy & Crit Care Med, Seoul, South Korea
[4] Catholic Univ Korea, Coll Med, Div Pulm Allergy & Crit Care Med, Seoul St Marys Hosp,Dept Internal Med, Seoul, South Korea
[5] Dongguk Univ, Coll Med, Dept Internal Med, Div Pulm, Seoul, South Korea
[6] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Div Pulm & Crit Care Med,Dept Med, Seoul, South Korea
[7] Hallym Univ, Sacred Heart Hosp, Dept Internal Med, Div Pulm Allergy & Crit Care Med, Anyang, South Korea
[8] Natl Evidence Based Healthcare Collaborating Agcy, Off Hlth Technol Assessment Res, Div Healthcare Technol Assessment Res, Seoul, South Korea
[9] Hallym Univ, Kangnam Sacred Heart Hosp, Div Pulm Allergy & Crit Care Med, Dept Internal Med, 1 Singil Ro, Seoul 07441, South Korea