1. Division of Pulmonary and Critical Care Medicine, University of Ulsan College of Medicine, Korea.
2. Division of Pulmonary and Critical Care Medicine, Department of Medicine, Samsumg Medical Center, Sungkyunkwan University School of Medicine, Korea.
3. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine and Lung Institutute of Medical Research Center, Seoul National University College of Medicine, Korea.
4. Korean Institute of Tuberculosis, Korea.