Contribution to authorship
SXB, YX: Study conception and
design, analysis of data, drafting and revising the article for
critically important intellectual content, final approval of the version
to be published. SQL, SD: Design of questionnaire, collection of data,
drafting and revising the article. ZPW: Study conception and design, ZPW
served as senior author and provided guidance to SXB and YX throughout
the project.