Author Contributions
JY, CD and DL conceived the idea for the study, participated in its
design and coordination, and provided final approval of the version to
be published. JY, DL and SB recruited patients into the study. RG
reviewed histological diagnosis. HG, AH and BK undertook data
management. DS performed statistical analysis. JY, CD, DS and DL wrote
the manuscript and all authors read and approved the final manuscript.