研究采用问卷调查的方法，在广州、深圳等地区的企业中收集数据，总的有效样本量为646份。

A self-administered questionnaire survey method was used to collect data from 646 employees and their supervisors in Guangzhou and Shenzhen.

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为扩大样本量，笔者采取了实地和网络调查相结合的多种灵活方式，最终收集到了411份有效问卷。

To enlarge the sample size, the data were collected via a variety of methods in both field survey and net survey, at last 411 valid questionnaires were collected.

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其优势紧张表如今样本量、前瞻性、多中间、长期随访且缺失相对较小、应用了有效的结果评价指标。

Its strengths include its size, prospective nature, multicenter involvement, long-term follow-up with relatively low attrition, and use of validated outcome measures.

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