Shariff Salimah Z, Sontrop Jessica M, Iansavichus Arthur V, Haynes R Brian, Weir Matthew A, Gandhi Sonja, Cuerden Meaghan S, Garg Amit X
Kidney Clinical Research Unit , London Health Sciences Centre , London, Ontario , Canada ; Department of Epidemiology and Biostatistics , Western University , London, Ontario , Canada.
Clin Kidney J. 2012 Dec;5(6):610-617. doi: 10.1093/ckj/sfs152. Epub 2012 Nov 11.
When searching for renal literature, nephrologists must choose between several different bibliographic databases. We compared the availability of renal clinical studies in six major bibliographic databases. METHODS: We gathered 151 renal systematic reviews, which collectively contained 2195 unique citations referencing primary studies in the form of journal articles, meeting articles or meeting abstracts published between 1963 and 2008. We searched for each citation in three subscription-free bibliographic databases (PubMed, Google Scholar and Scirus) and three subscription-based databases (EMBASE, Ovid-MEDLINE and ISI Web of Knowledge). For the subscription-free databases, we determined which full-text journal articles were available free of charge via links to the article source. RESULTS: The proportion of journal articles contained within each of the six databases ranged from 96 to 97%; results were similar for meeting articles. Availability of meeting abstracts was poor, ranging from 0 to 37% (P < 0.01) with ISI Web of Knowledge containing the largest proportion [37%, 95% confidence interval (95% CI) 32-43%]. Among the subscription-free databases, free access to full-text articles was highest in Google Scholar (38% free, 95% CI 36-41%), and was only marginally higher (39%) when all subscription-free databases were searched. After 2000, free access to full-text articles increased to 49%. CONCLUSIONS: Over 99% of renal clinical journal articles are available in at least one major bibliographic database. Subscription-free databases provide free full-text access to almost half of the articles published after the year 2000, which may be of particular interest to clinicians in settings with limited access to subscription-based resources.
在搜索肾脏学文献时，肾脏科医生必须在几个不同的文献数据库之间进行选择。我们比较了六个主要文献数据库中肾脏临床研究的可获取性。方法：我们收集了151篇肾脏系统评价，这些评价总共包含2195条独特的参考文献，这些参考文献以期刊文章、会议文章或会议摘要的形式引用了1963年至2008年间发表的原始研究。我们在三个免费文献数据库（PubMed、谷歌学术和Scirus）和三个付费数据库（EMBASE、Ovid-MEDLINE和ISI Web of Knowledge）中搜索了每一条参考文献。对于免费数据库，我们确定了哪些全文期刊文章可以通过链接到文章来源免费获取。结果：六个数据库中每个数据库包含的期刊文章比例在96%至97%之间；会议文章的结果相似。会议摘要的可获取性较差，范围从0%到37%（P<0.01），其中ISI Web of Knowledge包含的比例最大[37%，95%置信区间（95%CI）32 - 43%]。在免费数据库中，谷歌学术中全文文章的免费获取率最高（38%免费，95%CI 36 - 41%），当搜索所有免费数据库时，免费获取率仅略高（39%）。2000年以后，全文文章的免费获取率提高到49%。结论：超过99%的肾脏临床期刊文章可在至少一个主要文献数据库中获取。免费数据库为2000年以后发表的几乎一半文章提供免费全文访问，这对于难以获取付费资源的临床医生可能特别有意义。
