方法以中国学术期刊网、万方数据库为检索工具，检索1994 ~ 2005年国内公开发表的文献，录入SPSS统计分析软件包进行分析。
METHODS: The articles published in China from 1994 to 2005 were retrieved in CJFD and Wanfang Database put into SPSS package for statistical analysis.
方法以中国学术期刊网、万方数据库为检索工具，检索1994 ~ 2005年国内公开发表的文献，录入SPSS统计分析软件包进行分析。
METHODS: The articles published in China from 1994 to 2005 were retrieved in CJFD and Wanfang Database put into SPSS package for statistical analysis.
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