[1] Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Internal Medicine, Hallym University Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul
[2] Department of Gastroenterology, Hanyang University Hospital, Seoul
[3] Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Chungbuk National University Hospital, Chungbuk National University College of Medicine, Cheongju
[4] Biostatistical Consulting and Research Lab, Medical Research Collaborating Center, Hanyang University, Seoul
[5] Department of Ophthalmology, Seoul National University Hospital, Seoul
[6] Division of Pulmonary and Allergy, Department of Internal Medicine, Konkuk University Hospital, School of Medicine, Konkuk University, Seoul
[7] Division of Pulmonary Medicine and Allergy, Department of Internal Medicine, Hanyang University College of Medicine, Seoul