The impact of only-child status on adolescent mental health: a multi-center cross-sectional study using propensity score matching in Western China by Jinlong He, Yunling Zhong, Yuqin Song, Jing Luo, Cen Lin, Yuhang Wu, Lu Pan, Yu Cen, Jiayu Zhao, Shiya Gou, Nianjie Wang, Yao Wang, Lei Tang, Jiaming Luo

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