Liu, Tongtong
Wang, Xi
Li, Aixin
Ye, Jiangzhu
Shan, Duo
Zhang, Guang
Liu, An
Article History
Received: 17 November 2020
Accepted: 1 June 2021
First Online: 24 June 2021
Declarations
:
: The investigation was carried out in accordance with the latest version of the Declaration of Helsinki. This study was reviewed and approved by the Ethics Committee of the Center for STD and AIDS Prevention and Control, the Chinese Center for Disease Control and Prevention, and written informed consent was obtained from each participant.
: Not applicable.
: The authors declare that they have no competing interests.