方法：通过自填式问卷调查12个县内所有乡村医生。
Methods: All village doctors in 12 counties were surveyed with questionnaire.
方法采用分层整群抽样方法，对调查对象进行无记名自填式问卷调查。
Methods Female college students were sampled by cluster sampling and investigated by using questionnaire survey on anonymous basis.
方法对西安市一所综合性大学的1 500名本科生进行自填式问卷调查。
Methods 1 500 undergraduate students in a comprehensive university in Xi an city were investigated with a self-filled questionnaire.
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