Published on in Vol 8, No 5 (2020): May
1 Institute of Information Science, Beijing Jiaotong University, Beijing, China
2 Yidu Cloud Technology Inc, Beijing, China
3 College of Computer Science, Chongqing University, Chongqing, China
4 Southwest Hospital, Chongqing, China
5 Department of Computer Science, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, China
6 School of Science, Beijing Jiaotong University, Beijing, China
*these authors contributed equally