1. Department of Pulmonary and Critical Care MedicineChina‐Japan Friendship HospitalBeijingChina
2. Institute of Respiratory MedicineChinese Academy of Medical SciencesBeijingChina
3. National Clinical Research Center for Respiratory DiseasesBeijingChina
4. Capital Medical UniversityBeijingChina
5. Department of RadiologyChina‐Japan Friendship HospitalBeijingChina