[1
]Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal
Medicine, Seoul St Mary's Hospital, College of Medicine, The Catholic University of
Korea, Seoul, Korea.
[2
]Division of Pulmonary, Department of Internal Medicine, Severance Hospital, Yonsei
University College of Medicine, Seoul, Korea.
[3
]Department of Pulmonology and Critical Care Medicine, Asan Medical Center, University
of Ulsan College of Medicine, Seoul, Korea.
[4
]Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal
Medicine, Hallym University Sacred Heart Hospital, Hallym University College of Medicine,
Anyang, Korea.
[5
]Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal
Medicine, Hallym University Kangdong Sacred Heart Hospital, Hallym University College
of Medicine, Seoul, Korea.
[6
]Department of Internal Medicine, Division of Pulmonology, Konkuk University School
of Medicine, Seoul, Korea.
[7
]Division for Healthcare Technology Assessment Research, National Evidence-based Healthcare
Collaborating Agency, Seoul, Korea.
[8
]Divison of Pulmonary and Critical Care Medicine, Department of Internal Medicine,
Inje University Ilsan Paik Hospital, Inje University College of Medicine, Ilsan, Korea.
[9
]Department of Pulmonary and Critical Care Medicine, Kyung Hee University Hospital
at Gangdong, Kyung Hee University School of Medicine, Seoul, Korea.
[10
]Department of Internal Medicine, National Medical Center, Seoul, Korea.
[11
]Division of Pulmonary, Sleep and Critical Care Medicine, Department of Internal Medicine,
Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
[12
]Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine,
Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul
National University College of Medicine, Seoul, Korea.
[13
]Division of Pulmonology, Department of Internal Medicine, St. Vincent's Hospital,
College of Medicine, The Catholic University of Korea, Suwon, Korea.
[14
]Division of Pulmonary, Allergy and Critical Care Medicine, Department of Internal
Medicine, Bucheon St. Mary's Hospital, College of Medicine, The Catholic University
of Korea, Bucheon, Korea.
[15
]Department of Critical Care, Samsung Medical Center, Sungkyunkwan University School
of Medicine, Seoul, Korea.
[16
]Department of Pulmonary and Allergy, Department of Internal Medicine, Regional Respiratory
Center, Yeungnam University Hospital, Daegu, Korea.
[17
]Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine,
Wonkwang University Sanbon Hospital, Wonkwang University School of Medicine, Gunpo,
Korea.
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