http://hl7.org/fhir/StructureDefinition/researchStudy-studyRegistration|5.2.0

Dates for study registration activities.

Name	Card	Type	Description & Constraints
Extension	0..*		Dates for study registration activities
extension *	1..1	Extension	The specific activity
extension	?..0
url	?..?	uri
value[x] *	1..?		ResearchStudyRegistrationActivity (extensible)
valueCodeableConcept *	1..?	CodeableConcept	ResearchStudyRegistrationActivity (extensible)
extension	0..1	Extension	Actual if true, else anticipated
extension	?..0
url	?..?	uri
value[x] *	1..?
valueBoolean *	1..?	boolean
extension	0..1	Extension	Date range
extension	?..0
url	?..?	uri
value[x] *	1..?
valuePeriod *	1..?	Period
url	?..?	uri