1. SAMOVAR, Telecom SudParis, Institut Polytechnique de Paris, Palaiseau, France
2. Institute of Software, Chinese Academy of Sciences, Beijing, China
3. University of Chinese Academy of Sciences, Beijing, China
4. Microsoft Research Asia, Shanghai, China
5. University of Massachusetts Amherst, Amherst, USA
6. China Mobile Research Institute, Beijing, China
7. Peking University, Beijing, China