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Continue to ChatCDA Levels of Interoperability http://hongkongehr.stephenleung.idv.hk/2012/01/31/cda-levels-of-interoperability-hl7-standards/
CDA Levels of Interoperability http://hongkongehr.stephenleung.idv.hk/2012/01/31/cda-levels-of-interoperability-hl7-standards/