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【单选题】
Bruhn 等对宾夕法尼亚州意大利美国人聚集的一个小镇 Reseto 进行了研究 , 发现这个小镇的死亡率比邻镇的死亡率低。其最后的研究结论是 , 该小镇人群良好健康主要是与他们有紧密联系的社会关系 , 小镇平均主义的特征和人们互助精神有关。请问导致该小镇人群健康状况比较好的这些因素属于( )A.
政治因素
B.
社会网络因素
C.
个人因素
D.
卫生服务
E.
文化因素
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