1. 
   PubMed
   The US National Centre for Biotechnology Information (NCBI) and US National Library of Medicine's freely available online database and search facility. It contains more than 11 million references to the many indexed biomedical journal articles that are in MEDLINE, PreMEDLINE and other related databa...
   Found op http://www.cirem.co.uk/definitions.html
   
   
2. 
   PubMed
   Public Medline or Publisher Medline
   Found op http://www.encyclo.co.uk/local/20895
   
   
3. 
   PubMed
   PubMed is a free database accessing primarily the MEDLINE database of references and abstracts on life sciences and biomedical topics. The United States National Library of Medicine (NLM) at the National Institutes of Health maintains the database as part of the Entrez information retrieval system....
   Found op http://en.wikipedia.org/wiki/PubMed
   
   

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