Health information exchange model and standards (eg. HL7)

Write a short paper (2-4 pages) discussing health information exchange model and standards (eg. HL7) that have been created for this purpose. Also, include in your discussion how they help improve interoperability .

Please feel free to reference journal articles, other books and the web to develop content for the paper. But please make sure that the bibliographic list of references are cited in your paper as well as provided at the end of the paper.