make one paragraph out of these two

The HL7 Implementation Guide: Data Segmentation for Privacy (DS4P), Release 1 (IG) specifies the use of security labeling at the CDA Header, Section and Entry levels. Implementation of the CDA DS4P IG at the Header Level was included as an optional Certified EHR Certification criteria in the original 2015 Edition Health Information Technology (Health IT) Certification Criteria, 2015 Edition Base Electronic Health Record (EHR) Definition, and ONC Health IT Certification Program Modifications [1] (Final Rule – October 16, 2015).