[1] Seoul National University Hospital,Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine
[2] Kangwon National University College of Medicine,Division of Pulmonary and Critical Care Medicine
[3] Seoul Metropolitan Government-Seoul National University Boramae Medical Centre,Department of Radiology
[4] Division of Pulmonary and Critical Care Medicine,Department of Internal Medicine
[5] Department of Internal Medicine,undefined
[6] National Medical Centre,undefined
[7] Seoul National University College of Medicine,undefined
[8] Seoul National University College of Medicine,undefined