This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
CAT Link retrieval details. The numbers indicate how many documents were retrieved by the CAT Crawler meta-search engine.
Number of retrieved links
Articles from Biomedical Digital Libraries are provided here courtesy of BioMed Central