1. Division of Pulmonology and Allergy, Department of Internal Medicine, Regional Center for Respiratory Diseases, Yeungnam University Medical Center, College of Medicine, Yeungnam University, Daegu, Korea.
2. Division of Infection, Department of Internal Medicine, Yeungnam University Medical Center, College of Medicine, Yeungnam University, Daegu, Korea.
3. Aging Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Korea.