20th century cures entry

[nhoffman]

Compiling a few resources here:

https://www.cms.gov/Regulations-and-Guidance/Guidance/Interoperability/index

[nhoffman]

https://www.healthit.gov/isa/united-states-core-data-interoperability-uscdi

[nhoffman]

Dec 31 2022 API criterion: https://www.healthit.gov/test-method/standardized-api-patient-and-population-services

FHIR bulk access API: https://hl7.org/fhir/uv/bulkdata/STU1.0.1/