1. Institute of Special Education, Faculty of Education, Beijing Normal University, Beijing, P.R. China
2. Faculty of Elementary Education, Yi-Zhuang Experimental Primary School, Beijing, P.R. China
3. Faculty of Elementary Education, Tianfu New Area Special Education School of Sichuan, Chengdu, P.R. China
4. School of Education, College of Social Sciences, University of Glasgow, Glasgow, United Kingdom