About the Authors

Xiao-Qian Sun
Hua-Wei Shen
Xue-Qi Cheng


Affiliation Institute of Computing Technology, Chinese Academy of Sciences, Beijing, China

Zhao-Yang Wang

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: XQS HWS XQC. Performed the experiments: XQS HWS. Analyzed the data: XQS. Contributed reagents/materials/analysis tools: XQS HWS ZYW. Wrote the paper: XQS HWS XQC.