1. Department of Occupational Health & Radiation Hygiene, Hangzhou Hospital for the Prevention and Treatment of Occupational Disease, Hangzhou, Zhejiang, China
2. School of Public Heath, Hangzhou Medical College, Hangzhou, Zhejiang, China
3. Department of Pulmonary and Critical Care Medicine, Cixi People Hospital Medical Health Group (Cixi People Hospital), Cixi, Zhejiang, China