Liu, Xiaoman
Wang, Chao
Wang, Jin
Ji, Yuqing
Li, Shuang
Article History
Received: 15 September 2020
Accepted: 6 July 2021
First Online: 16 July 2021
Declarations
:
: The study protocol was approved by the Medical Ethics Committee of the National Institute of Occupational Health and Poison Control (Code No. 201502). All participants gave written informed consent before recruited into the study.
: Not applicable.
: The authors declare that they have no competing interests.