1. Division of Allergy, Pulmonary, and Critical Care Medicine, Department of MedicineVanderbilt University School of MedicineNashvilleUSA
2. Division of Pulmonary and Critical Care MedicineChiayi Christian Hospital600Chia‐YiTaiwan
3. Department of Life ScienceNational Chung Hsing UniversityTaichungTaiwan
4. Department of Respiratory TherapyChina Medical UniversityTaichungTaiwan
5. Department of PathologyMicrobiology and ImmunologyVanderbilt University School of MedicineNashvilleUSA