Contribution to authorship
DL, BS and DF conceived and designed the study. DL, BS, DF, JS, PL, HJ,
YM, HY and YP performed data acquisition and interpretation. DL, BS, DF,
JS, and PL wrote the paper. DL, BS, and DF have accessed and verified
the data. All authors confirmed that they had full access to all the
data in the study and accepted responsibility to submit for publication.