AUTHOR CONTRIBUTION
Jingjing Xia and Liang Chang designed the work; Jingjing Xia, Yuqing
Jia, Dashuang Xu, Zhaoyu Geng and Sihua Jin collected samples and
contributed genetic data; Jingjing Xia, Liang Chang, Yuanfei Ding and
Chengcheng Cao contributed data analysis; Jingjing Xia and Liang Chang
drafted the manuscript. All authors critically revised and approved the
final manuscript.