Author contributions
RECRUITMENT
Study design: X.M.Y., J.B.W. Patient recruitment: Y.J.W., F.L. Data collection: Y.J.W., F.L. Analysis and interpretation of results: X.M.Y., J.B.W. Manuscript reviewing: X.M.Y., J.B.W. Writing up of the manuscript: X.M.Y., J.B.W. Statistical analyses: Y.Z, J.B.W. Gave final approval of the version to be published: all authors.