Authors’ contributions
CZY and WJH conceptualized and designed the study, drafted the initial manuscript, and reviewed and revised the manuscript. FYY, XXT, LYM, LY and CLH designed the data collection instruments, collected data, carried out the initial analyses, and reviewed and revised the manuscript. GXH and WJH coordinated and supervised data collection, and critically reviewed the manuscript for important intellectual content. All authors approved the final manuscript as submitted and agree to be accountable for all aspects of the work.