Authors’ contributions
All authors had full access to the study data and take responsibility for the integrity of the data and the accuracy of the data analysis. SY and IF contributed to the conception or design of the study. SY, JZ, GL, ZX, and PPR were study investigators, who contributed to the acquisition of data. ZX, GJ, and KR directly accessed and verified the underlying data. GJ and KR conducted the statistical analyses, and all authors contributed to the interpretation of data. SY, JZ, GL, ZX, AE, GJ, IF, KR, and PPR were involved in drafting the manuscript and critically revised the manuscript for important intellectual content. All authors provided final approval of the manuscript content for submission and had final responsibility for the decision to submit for publication.