Funding for this research was provided by:
Natural Science Foundation of Tianjin Municipal Science and Technology Commission (16JCZDJC31900)
Special Project on Health Care of Logistics Support Department of the Central Military Commission (20BJZ50)
Received: 14 July 2020
Accepted: 10 January 2021
First Online: 19 January 2021
Ethics approval and consent to participate
: This study has been approved by the Ethics Committee of Special Medical Center of Chinese Armed Police Force. All the patients had been informed about the rights and obligations in this study and signed in informed consent before took part in.
: Not applicable.
: There was no competing interests to be declared.