Created value set for all GTR IDs related to cancer.
Created value set for all GTR IDs related to cancer.

Value Set Curation notes:
- this value set is meant to be extensible. Changes are updated daily.
- some term descriptions might have special characters inserted. This was present in the original file downloaded and unzipped from GTR. short-term we can edit them manually until I customize the script to remove all variations of special characters from the data set.

Filter criteria:
- condition name matching 'cancer'
- testing facilities in the US (facility_country = 'United States')
- filter for flag lab_currstat = 1 as of 2018-12-11. not all versions are included, but I can easily remove the filter and re-run the CIMPL term  converter if we want a comprehensive list of all possible versions. we're also covered if we make this value set extensible.

standardhealth/shr_spec