Author Contributions
Ke-yi Tang carried out the sample collection, experimental procedures,
data analysis, and drafted the manuscript. Fei Xie, Dan Chen and Bo-xin
Qin carried out the sample collection and DNA extraction. Hong-yi Liu
participated in analyzing data and drafting the manuscript. Chang-kun Fu
and Qiong Wang participated in sample collection and experimental
procedures. Shun-de Chen conceived and designed research, and helped to
draft the manuscript. All authors read and approved the manuscript.