1. Department of Respiratory Medicine, Qilu Children’s Hospital of Shandong University, Ji’nan, People’s Republic of China
2. Department of Emergency, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Ji’nan, People’s Republic of China
3. Department of Toxicology, Shandong Academy of Occupational Health and Occupational Medicine, Shandong First Medical University & Shandong Academy of Medical Sciences, Ji’nan, People’s Republic of China
4. School of Public Health Shandong University, Ji’nan, People’s Republic of China