Authors’ contributions
Y.L. conceived and designed the study and was a major contributor of manuscript writing; Y.Y.G. and C.F.Z. collected the data; P.P.M. and Y.B.G. analyzed and interpreted the patient data; X.N.H. and Z.Y.Y. performed the study. J.Y.X. and Z.H.D. performed the statistical analysis and revised the manuscript critically for important intellectual content. All authors read and approved the final manuscript.