1. Department of Internal MedicineUniversities of Giessen and Marburg Lung CenterGiessenGermany
2. Department of Respiratory TherapyCollege of MedicineChang Gung UniversityTao‐YuanTaiwan
3. Graduate Institute of Clinical Medical SciencesCollege of MedicineChang Gung UniversityTao‐YuanTaiwan