AUTHOR CONTRIBUTIONS
B.L.U., M.Z., and T.D.B. designed the study. S.K., E.W., S.W., M.B.,
J.L., M.J.R. and L.N.F. were responsible for research coordination and
sample collection. Y.J.L. and S.G.X. performed the research and data
analysis. Y.J.L. drafted the manuscript. B.L.U. edited the manuscript
for final submission. All authors have reviewed and approved the
submitted manuscript.