Funding for this research was provided by:
the United Nations Development Programme
Received: 13 January 2021
Accepted: 9 August 2021
First Online: 22 September 2021
: This study (secondary data analysis) was granted ethical approval by the Ethics Committee at Second Xiangya Hospital, Central South University. Informed consent was given by all participants. Participants were ensured that the participation was completely voluntary, and their information would be kept confidential. The ethics committee has granted a waiver of parental consent from youths aged younger than 18 years.
: Not applicable.
: The authors declare that they have no competing interests.