Jiesi Guo1, Xin Tang2, Kate M Xu3. 1. Institute for Positive Psychology and Education, Australian Catholic University, North Sydney, NSW 2059, Australia; jiesiguo@gmail.com. 2. Faculty of Educational Sciences, University of Helsinki, 00014 Helsinki, Finland. 3. Welten Institute, Open University of the Netherlands, 6419 AT Heerlen, The Netherlands.