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Xia et al. have extensively described five major biomedical databases originating from China: CNKI, Chinese Biomedical Literature (CBM), Chinese Medical Current Content (CMCC), VIP, and WANFANG (China Online Journals) [15]. They reported that less than 6% of the 2,500 journals indexed in these databases were also indexed in MEDLINE. All databases had advanced search features that allowed combining keywords with Boolean and proximity operators. Four databases had even more advanced search features that allowed command-line-style queries with keywords, fields, Boolean, and proximity operators. All databases accepted English-written queries but all were also language sensitive. In terms of accessibility, all databases but CBM gave free access to study abstracts and offered the possibility to purchase full-text articles without full subscription to the database. CBM search features were accessible to subscribers only. In another recent evaluation of the relevance of searching Chinese biomedical databases (CBM, CNKI, VIP, and WANFANG) when conducting systematic reviews, Ai et al. found that CBM and CNKI were the two databases that covered the most journals (1,784 and 1,126, respectively) [16]. The authors recommended CBM for reviewers who aim to search for studies in Chinese and CNKI for non-Chinese-speaking researchers. 153554b96e
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