Though few comprehensive studies have been conducted, one by the University of Washington investigated how drug sample availability affected what physicians prescribe.

尽管人们几乎没有进行过全面的研究，但是华盛顿大学的一项研究调查了药品样本的可获得性对医生开的处方的影响。

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One of the most comprehensive studies comes from Denmark.

最出色的研究之一来自于丹麦的研究。

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However, until now there had been no comprehensive studies of break dancing injuries.

然而，到现在也没有对霹雳舞受伤进行全面的研究。

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The University of Southern California has been conducting one of the most comprehensive studies on the long-term impact of smog on young people.

CNN: Research finds smog could deal a blow to children's health

While consumers may intuitively believe that advertising to children and obesity are joined at the hip, the most comprehensive studies addressing that question are far from definitive.

FORBES: Is 2013 a Watershed Year for the Anti-Obesity Movement?

One of the most comprehensive studies into media sharing and consumption habits in the United States and Germany reveals that file-sharers buy 30% more music than their non-sharing counterparts.

FORBES: File Sharers Buy More Music Than Non-File Sharers: Not Quite What The Report Says