《美国国家健康访问调查》的结果显示，在2008年下半年，超过20%的美国家庭只使用无线业务。

In the second half of 2008, more than 20% of U.S. households had only wireless service, according to a National Health Interview Survey.

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一个照顾者或健康专业人士可以通过互联网访问此可协助他们确定新出现的问题的信息，调查的起因和计划的任何可能的补救行动。

A carer or health professional can access this information over the Internet which may assist them to identify emerging problems, investigate the causes and plan any possible remedial action.

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这份研究是一个庞大长期的健康调查通过对13的青少年进行访问而产生的。

The findings are based on interviews with 13-year-olds taking part in a larger, long-term health study.

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