The semi-structured interviews were conducted online using Tencent QQ/WeChat by two researchers (L.Z. and Y.C.) who had experience in conducting qualitative interviews and did not have a relationship with the interviewees. Interviews were audiotaped with the permission of the participants and transcribed. Transcripts were translated into English and back-translated into Chinese for accuracy. The English-translated versions were then used for data analysis. All transcripts were not returned to participants for comment. Interviews ranged from 46 to 66 min with an average duration of 55 min.
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