Authorship and author contribution
All named authors meet the International Committee of Medical Journal Editors (ICMJE) criteria for authorship for this article, take responsibility for the integrity of the work as a whole, and have given their approval for this version to be published. Conception and design of the study: DW, FX and XQC. Literature search and collection and compiled pictures and videos: JRC, JQC. Acquisition, analysis and interpretation of data: WG, HG, JCH, and XLY. Drafting the article and revising it critically for important intellectual content: JRC, JQC, DW and FX. Final approval of the article: JRC, JQC, WG, HG, XQC, XNW, FX and DW. JRC and JQC should be considered joint first author.