Author contributions
S.H.P. and H.-I.K. had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: S.H.P. and H.-I.K. Acquisition of data: S.H.P., J.H., and K.-Y.K. Analysis and interpretation of data: S.H.P., M.C., Y.M.K., and W.J.H. Drafting of the manuscript: S.H.P. and H.-I.K. Critical revision of the manuscript for import intellectual content: H.-I.K. Statistical analysis: S.H.P., Y.N.K., and J.H. Administrative, technical, or material support: M.C., Y.M.K., and W.J.H. Obtaining funding: H.-I.K. Study supervision: W.J.H. and H.-I.K. All authors contributed to the article and approved the submitted version.