Volpp says more studies are needed to measure the real impact of incentive programs on obesity.

VOA: standard.2010.07.16

Several things come to mind. First of all, the Greeks now live in places where they never lived before and their presence has a real impact of a different degree in every place.

有如下几点,首先,希腊人如今定居在他们从未居住的地方,并且他们的出现,对于每个地区都有不同程度的影响

耶鲁公开课 - 古希腊历史简介课程节选