AUTHOR CONTRIBUTION
Conceived and designed the experiments: Hua Rong; Performed the experiments: Fang Jiao, Lei Zhang; Analyzed the data: Fang Jiao, Lei Zhang; Wrote the paper: Fang Jiao, Hua Rong; Review and editing: Hua Rong and Samwel Mchele Limbu. All authors read the manuscript and approved it in its final version.