1. Department of Internal Medicine, Division of Infectious Disease, Seoul Medical Center, Seoul, South Korea;
2. Department of Internal Medicine, Division of Infectious Disease, Yonsei University College of Medicine, Seoul, South Korea;
3. Department of Internal Medicine, Division of Pulmonology, Institute of Chest Diseases, Yonsei University College of Medicine, Seoul, South Korea;
4. Department of Thoracic and Cardiovascular Surgery, Yonsei University College of Medicine, Seoul, South Korea