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     BC CDA E2E AssignedEntity (2.16.840.1.113883.3.1937.777.17.10.20)
    1. Header
       BC CDA E2E Person (2.16.840.1.113883.3.1937.777.17.10.43)
    2. Header
       BC CDA E2E Organization (2.16.840.1.113883.3.1937.777.17.10.21)