1. Department of Medicine; Taipei Medical University College of Medicine; Taipei Taiwan
2. Department of Medicine; Chang Gung University College of Medicine; Taoyuan Taiwan
3. Department of Thoracic Medicine; Chang Gung Memorial Hospital; Chang Gung Medical Foundation; Taoyuan Taiwan
4. Center of Nanotechnology; Chung Yuan Christian University; Zhongli District, Taoyuan City Taiwan
5. Airway Disease Section; National Heart and Lung Institute; Imperial College London; London UK
6. NIHR Respiratory Biomedical Research Unit; Royal Brompton NHS Foundation Trust; London UK