Limitations to this study include the cross-sectional design and self-report of sun exposure.
此项研究的局限性包括横向设计及自我报告日晒情况。
DESIGN: a cross-sectional study according to the diagnosis and on the basis of community.
设计：以诊断为依据、社区为基础的横断面研究。
Methods: The method of cross sectional study was adopted.
方法：采用横断面调查研究方法。
Methods: The method of cross sectional study was adopted.
方法：采用横断面调查研究方法。
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