Article History
Received: 27 October 2019
Accepted: 26 May 2020
First Online: 10 June 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the Research Ethics Board of Southern Medical University on 12th January 2018. Participants were provided with a participant information sheet and asked to sign a consent form prior to the interviews being undertaken. For participant under 16 years old, written informed consent was obtained from their parents/guardians while the participants provided written assent.
: Not applicable.
: The authors declare that they have no competing interests.