Migrant adolescents’ behavioral problems compared to host adolescents and adolescents in their region of origin: a longitudinal study oleh Jian-Qun Fang, Yan-rong Wang, Yun-Yun Du, Guo-Li Yan, Fu-Li Ma, Yan-Qiu Liu, Wen-Xi Sun, Shi-Qi Chen, Li-Ping Feng, Jia Wei, Hao Liu, Jing Hu, Zhao-Xia Zhang