1. The security rule: U.S. Department of Health and Human Services. http://www.hhs.gov/hipaa/for-professionals/security/index.html
2. X12: American National Standards Institute. www.x12.org
3. Health level seven international: Health Level Seven International. http://www.hl7.org/
4. Welcome to fhir: Health Level Seven International. http://www.hl7.org/fhir/
5. Hl7 version 2 product suite: Health Level Seven International. https://www.hl7.org/implement/standards/productbrief.cfm?productid=185