目的：研究不同社会阶层之间的健康公平性。
Objective To study the health equality in difference social stratification.
国家内部和国家之间人群健康状况方面的更大公平性应当被视为衡量我们作为一个文明社会如何取得进展的关键尺度。
Greater equity in the health status of populations, within and among countries, should be regarded as a key measure of how we, as a civilized society, are making progress.
这样做将能实现多项目标：更好的健康，较少的疾病，更高的公平性，以及卫生系统绩效方面的广泛改进。
Doing so would meet several objectives: better health, less disease, greater equity, and vast improvements in the performance of health systems.
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