Institution: | 1.Department of Respiratory Medicine,Affiliated Hospital of Guilin Medical College,Guilin 541001,China;2.Department of Respiratory Medicine,Tongji Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan 430030,China;3.College of Environment and Resources,Jilin University,Changchun 130012,China.E-mail: fangcs@jlu.edu.cn |