Contribution to authorship
HQ, CT, and RS contributed to the study design. YY, LW, YL and LW
collected data. YY and XL analyzed data. YY and LW wrote the manuscript.
MK contributed to the interpretation of results. PB and RS assisted with
the detailed editing of the manuscript to get it to the appropriate
language. HQ and CT revised the final version and are guarantors of this
manuscript. All authors made substantial contributions to the paper and
read and approved the final manuscript.