Received: 25 November 2021
Revised: 21 December 2021
Accepted: 27 December 2021
First Online: 4 January 2022
: The study protocol was reviewed and approved by the institutional review board of Beijing Normal University. (Ref: SP012/18/19).
: In the beginning of the interviews, we presented an information sheet to participants explaining the research and the possibility of publishing the results in academic journals. Afterwards, consent was obtained by asking each participant to indicate their consent to participate by signing a consent document. Participation was voluntary and confidentiality was ensured. No personal details were collected except nationality and age.
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