They examined data from nearly 5,000 13- to 15-year-olds collected between 2005 and 2012 by what's called the Health Survey for England.

研究人员对英格兰健康调查机构于2005至2012年收集的近5000名13-15岁青少年的数据进行了调查研究。

And it plans to survey its students' mental health twice a year for the next three years to probe the mental health of the institute.

它还计划在未来三年内每年两次调查学生的心理健康状况， 以了解研究所的心理健康状况。

For a separate study, Kersh and his colleagues surveyed health care providers about their knowledge of alpha-gal syndrome and how to treat it.

在另一项研究中，克什和他的同事调查了医疗保健提供者对 α-gal 综合征的了解以及如何治疗它。