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.