Affiliations

• ¹ Department of Pulmonary, Allergy and Critical Care Medicine, Hallym University Kangnam Sacred Heart Hospital, Seoul, Korea.
• ² Department of Pulmonary and Critical Care Medicine, Inha University College of Medicine, Incheon, Korea.
• ³ Department of Pulmonary and Critical Care Medicine, Yeungnam University Hospital, Daegu, Korea.
• ⁴ Department of Pulmonary and Critical Care Medicine, Inje University Sanggye Paik Hospital, Seoul, Korea.
• ⁵ Department of Internal Medicine, Myongji Hospital, Goyang, Korea.
• ⁶ Department of Pulmonary and Critical Care Medicine, Kyung Hee University Hospital at Gangdong, Seoul, Korea.
• ⁷ Department of Pulmonary and Critical Care Medicine, Chungnam National University Hospital, Daejeon, Korea.
• ⁸ Department of Internal Medicine, Pusan National University Hospital, Busan, Korea.
• ⁹ Department of Pulmonary, Critical Care and Sleep Medicine, St. Paul's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
• ¹⁰ Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea.
• ¹¹ Department of Internal Medicine, Hanyang University Guri Hospital, Guri, Korea.
• ¹² Department of Pulmonary, Allergy and Critical Care Medicine, Jeonbuk National University Hospital, Jeonju, Korea.
• ¹³ Department of Pulmonary, Allergy and Critical Care Medicine, Hallym University Sacred Heart Hospital, Anyang, Korea.
• ¹⁴ Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.