Intersection of http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113762.1.4.1267.16 and http://hl7.org/fhir/ValueSet/iso3166-1-2
This is the ValueSet that contains codes in both Answer Set with Yes No and Unknowns (http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113762.1.4.1267.16) and Iso 3166 Part 1: 2 Letter Codes (http://hl7.org/fhir/ValueSet/iso3166-1-2).