1. Department of Epidemiology College of Preventive Medicine Army Medical UniversityThird Military Medical University) Chongqing China
2. Department of Thoracic Surgery Xinqiao HospitalArmy Medical UniversityThird Military Medical University) Chongqing China
3. Department of Respiratory Disease Xinqiao HospitalArmy Medical UniversityThird Military Medical University) Chongqing China