[1] The First Affiliated Hospital of Anhui Medical University,Department of Respiratory and Critical Care Medicine
[2] Hefei Second People’s Hospital,Department of General Medicine
[3] The First Affiliated Hospital of Anhui Medical University,Department of Thoracic Surgery
[4] Hefei Third Clinical College of Anhui Medical University,undefined
[5] Hefei Prevention and Treatment Center for Occupational Diseases,undefined