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Cheng-Cheng Han; Rong Liu; Ru-Ru Liu; Zhong-Hai Zhu; Rong-Bin Yu; Le Ma;
School of Public Health Xi’an Jiaotong University College of Medicine 76 Yanta West Road;
Xi’an Center for Disease Control and Prevention 599 Xiying Road;
asthenopia risk factor epidemiological feature college student;
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