该研究是由南加州大学(University of Southern California)凯克医学院(Keck School of Medicine)研究员进行的,调查对象是9,000多名初高中学生,他们来自中国七个人口密集的城市中收入水平各异的家庭。
该研究是由南加州大学(University of Southern California)凯克医学院(Keck School of Medicine)研究员进行的,调查对象是9,000多名初高中学生,他们来自中国七个人口密集的城市中收入水平各异的家庭。
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