Authors’ contributions
Study concept & design: J.M.L., J.H.Y. Literature research: all authors. Fund acquisition: J.M.L. Study supervision: J.M.L. Data acquisition: J.M.L., J.H.Y. Clinical study: J.H.Y., J.Y.P., S.M.L., E.S.L., J.H.K. Statistical analysis: performed by Medical Research Collaborating Center at Seoul National University Hospital and Seoul National University College of Medicine, under the supervision of J.M.L., J.H.Y. Original drafting: J.H.Y. Critical revision: all authors. All authors read and approved the final manuscript.