Title: Be short, accurate, and unambiguous; Give your paper a distinct personality; Begin with the subject of the study.
Introduction：What is known; What is unknown; Why we did this study?
Methods：Participants, subjects; Measurements; Outcomes and explanatory variables; Statistical methods.
Results：Sample characteristics; Univariate analyses; Bivariate analyses; Multivariate analyses.
Tables and figures：No more than six tables or figures; Use Table 1 for sample characteristics (no P values); Put most important findings in a figure.