Funding for this research was provided by:
nature science fundation of China (8197 0365)
Article History
Received: 22 March 2020
Accepted: 3 December 2020
First Online: 9 December 2020
Ethics approval and consent to participate
: This study was approved by the ethics committee of the First Affiliated Hospital of Xi’an Jiaotong University, due to the highly contagious nature of Covid-19, in order to avoid the potential cross-infection, verbal informed consent was obtained from all patients or family members, and the text of each patient’s verbal consent was recorded by the investigator in the patient’s medical records and research files. All data of patients used in this study was anonymous.
: Not Applicable.
: The authors declare that they have no competing interests.