Table 1 Research settings

01

Department of respiratory medicine, Chinese People’s Liberation Army General Hospital

02

Department of emergency, Chinese People’s Liberation Army General Hospital

03

Department of respiratory medicine, First Affiliated Hospital of Chinese People’s Liberation Army General Hospital

04

Department of emergency, First Affiliated Hospital of Chinese People’s Liberation Army General Hospital

05

Chinese People’s Liberation Army General Hospital of Rocket Forces

06

Navy General Hospital of Chinese People’s Liberation Army

07

Beijing Shi Ji Tan Hospital, Capital Medical University

08

Tianjin First Center Hospital

09

The Fourth Affiliated Hospital of China Medical University