1. AHRQ 2013 https://healthit.ahrq.gov/health-it-tools-and-resources/childrens-electronic-health-record-ehr-format
2. Almeida , M.B. 2013 http://onlinelibrary.wiley.com/doi/10.1002/asi.22861/abstract
3. Almeida , M.B. Slaughter , L. Brochhausen , M. 2012 http://mba.eci.ufmg.br/downloads/TowardsOntology.pdf