AUTHORS’ CONTRIBUTIONS
All authors contributed equally. Shuangcui Wang designed the review, prepared the figure, and wrote the manuscript. Guan Zhang and Qian Cui were involved in the conception and design of the study. Yanjie Yang and Dong Wang searched the literature.Aqing Liu and Ying Xia were involved in the conception and design of the study and revised the manuscript. Wentao Li,Jing Zhang and Yunhe Liu provided helpful comments. Jianchun Yu revised the manuscript. All authors read and approved the final manuscript.