1. HCLSIG. (April, 2015). Semantic Web Health Care and Life Sciences Interest Group.Retreived from http://www.w3.org/blog/hcls/.
2. BioPortal. (April, 2015). The world's most comprehensive repository of biomedical ontologies. Retreived from https://bioportal.bioontology.org/.
3. SNOMEDCT. (April, 2015).Systematized Nomenclature of Medicine - Clinical Terms. Retreived from http://www.ihtsdo.org/snomed-ct .
4. LOINC. (April, 2015). LOINC Logical Observation Identifier Names and Codes. Retreived from http://loinc.org/.
5. MedDRA. Medical Dictionary for Regulatory Activities. Retreived from http://www.meddra.org/.