1. Division of Pulmonary and Allergy Medicine, Department of Internal Medicine, Chung-Ang University Hospital, Seoul, Korea.
2. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea.
3. College of Pharmacy, Chung-Ang University, Seoul, Korea.
4. Department of Global Innovative Drugs, Graduate School of Chung-Ang University, Chung-Ang University, Seoul, Korea.