1. Teachers college, Beijing Union University, Beijing, People’s Republic of China
2. School of Educational Technology, Faculty of Education, Beijing Normal University, Beijing, People’s Republic of China
3. Beijing Advanced Innovation Center for Future Education, Beijing Normal University, Beijing, People’s Republic of China
4. KM&EL Lab, Faculty of Education, The University of Hong Kong, Hong Kong, People’s Republic of China
5. Department of Educational Information Technology, East China Normal University, Shanghai, People’s Republic of China