1. Department of Philosophy, Anhui University, Hefei 230039, People’s Republic of China
2. Beijing No. 5 Middle School, Beijing 100007, People’s Republic of China
3. Institute of Developmental Psychology, Beijing Normal University, Beijing 100875, People’s Republic of China
4. Family Science Department, Center for Healthy Families, UMD Prevention Research Center, School of Public Health, University of Maryland, College Park, MD 20742-2611, USA