Hu, Xiao
Zhang, Jingzhou
Cao, Yu
Article History
Received: 14 July 2021
Accepted: 27 April 2022
First Online: 14 May 2022
Declarations
:
: This study was conducted in accordance with the Declaration of Helsinki. Survey protocol was approved by the NCHS (National Center for Health Statistics) Research Ethics Review Board prior to study initiation. All participants provided written informed consent.
: Not applicable.
: XH reports no conflict of interest. JZ reports no conflict of interest. YC reports no conflict of interest.