Intersection of http://hl7.org/fhir/ValueSet/undesirable-effect-frequency and http://hl7.org/fhir/ValueSet/undesirable-effect-frequency
This is the ValueSet that contains codes in both Undesirabl Effect Frequency (http://hl7.org/fhir/ValueSet/undesirable-effect-frequency) and Undesirabl Effect Frequency (http://hl7.org/fhir/ValueSet/undesirable-effect-frequency).