projectcypress/health-data-standards — pull request #201 by andrequina (2014-09-12 21:28:07+00:00)
Title: Update subset operators and temporal references

updates subset operators and temporal references to align with QDM guidance:

https://github.com/projectcypress/health-data-standards/tree/master/resources/qdm_hqmf_r2.1_patterns