Intersection of http://hl7.org/fhir/ValueSet/observation-methods and http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.11.20.9.80
This is the ValueSet that contains codes in both Observation Methods (http://hl7.org/fhir/ValueSet/observation-methods) and Pregnancy Status Determination Method (http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.11.20.9.80).