About the Authors
- Xiang Zhang
- Department of Electrical Engineering and Computer Science, Case Western Reserve University, Ohio, United States of America
- Shunping Huang, Zhaojun Zhang
- Department of Computer Science, University of North Carolina at Chapel Hill, North Carolina, United States of America
- Wei Wang
- Department of Computer Science, University of California at Los Angeles, California, United States of America
The authors have declared that no competing interests exist.