1. Department of Chest Medicine, Shin-Kong Wu Ho-Su Memorial Hospital , Taipei , Taiwan
2. School of Dentistry, Chung Shan Medical University , Taichung , Taiwan
3. School of Medicine, Chung Shan Medical University , Taichung , Taiwan
4. Graduate Institute of Clinical Medicine, Taipei Medical University , Taipei , Taiwan
5. School of Respiratory Therapy, Taipei Medical University , Taipei , Taiwan
6. Division of Pulmonary Medicine, Department of Internal Medicine, Taipei Medical University-Wan Fan Hospital , Taipei , Taiwan