For the study, the researchers used the two thousand seven National Survey of Children's Health.

VOA: special.2010.05.06

National Public Radio asked exactly this question in a survey a year or so ago and they got the following principal responses back.

国家公共广播电台问过,完全相同的问题,在一次一年前的民意调查中,他们得到了如下的回复

耶鲁公开课 - 聆听音乐课程节选

The research is called the National Survey on Drug Use and Health.

VOA: special.2010.10.11

A national survey finds that one in four parents in the U.S.believe that vaccines containing thimerosal cause autism in healthy children and one in eight have refused at least one ecommended dose of vaccine.

VOA: standard.2010.03.23

The researchers used a national long-term survey of adolescent health to investigate the relationship between media use and depression.

VOA: special.2009.02.11

American researchers used a national long-term survey of adolescent health to investigate the link between media use and depression.

VOA: special.2009.03.10

India's current National Family Health Survey shows that more than twenty percent of Indians living in cities are overweight or obese.

VOA: special.2010.05.12

Now,after analyzing data from a large national health and nutrition survey, Skinner reports finding similarly elevated levels in obese children as well.

VOA: standard.2010.03.09