The researchers were from the University of Colorado Denver, Denver, Colorado; Washington University, St. Louis, Missouri; and the University of Pennsylvania, Philadelphia, Pennsylvania.
研究人员来自科罗拉多丹佛大学，华盛顿大学，圣路易斯大学，密苏里大学及宾夕法尼亚，费城的大学。
The researchers were from the University of Colorado Denver, Denver, Colorado; Washington University, St. Louis, Missouri; and the University of Pennsylvania, Philadelphia, Pennsylvania.
研究人员来自科罗拉多丹佛大学，华盛顿大学，圣路易斯大学，密苏里大学及宾夕法尼亚，费城的大学。
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