Author contributions statement Conceptualization, Xinbiao Guo, Furong Deng and Wei Niu; methodology, Furong Deng, Wei Niu, Miranda Loh, John Cherrie, Mark R. Miller and Chun Lin; investigation, Wei Niu, Jiahui Chen, Chen Huang, Zhihong Zhang, Le Ma, Rui Li and Shaowei Wu; writing and editing, Wei Niu, Wanzhou Wang, John Cherrie, Chun Lin and Mark R. Miller; funding acquisition, Xinbiao Guo.