本文共分为六个部分：第一部分首先对“人口素质”相关国内外研究进行综述分析，阐释研究背景；
This paper could be divided into six parts. The first part concludes relevant domestic and foreign theories on "population quality" and interpretation of research background.
从一般因素、与治疗有关的因素、社会心理学因素方面，综述分析了乳腺癌病人发生抑郁的相关因素。
It reviewed and analyzed the relevant factors of breast cancer patients developed depression from aspects of common factors, therapy-related factors and social-psychological factors.
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