Researchers from the JKM Technologies company in Virginia, the University of Virginia and the University of Colorado did the study.

佛吉尼亚jkm技术公司，佛吉尼亚大学和科罗拉多州的研究人员进行了这项调查。

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Other times they ran barefoot. Researchers from the JKM Technologies company in Virginia, the University of Virginia and the University of Colorado did the study.

VOA: special.2010.02.03