1. Division of Pulmonary, Sleep, and Critical Care Medicine, Department of Internal Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
2. Department of Pharmacology and Pharmacogenomics Research Center, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
3. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Inje University Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.