1. University of Science and Technology of China & National Institute of Informatics, Hefei, China
2. Tencent Advertising, Shanghai, China
3. LINKE Lab, School of Computer Science and Technology, University of Science and Technology of China & CAS Key Laboratory of Wireless-Optical Communications, University of Science and Technology of China, Hefei, China
4. Information Systems Architecture Science Research Division, National Institute of Informatics, Tokyo, Japan