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一、资料和方法1．资料来源利用中国生物医学文献光盘数据库1983～1997年全部题录，把36种预防医学期刊发表的文献题录，按照著录篇名、作者单位、杂志名称或出版单位、卷、期、页从光盘上摘录下来进行统计。2．方法按照著录内容进行逐年计量统计后，汇总分析并作出讨论。二、?
First, information and methods 1. Sources of information Using all the bibliographic records from 1983 to 1997 of the Chinese Biomedical Literature CD-ROM database, the bibliographic references published in 36 kinds of preventive medicine journals were collected from the CD-ROM according to the title, author’s name, magazine name or publishing unit, Excerpts on the statistics. 2. Methods According to the bibliographic content of annual statistics, the summary analysis and discussion. two,?