feat: added dhki stratifiers

resources/cql/DHKI_STRAT_ENCOUNTER_STRATIFIER

@@ -0,0 +1,5 @@
+define Encounter:
+if InInitialPopulation then [Encounter] else {} as List<Encounter>
+
+define function Departments(encounter FHIR.Encounter):
+encounter.identifier.where(system = 'http://dktk.dkfz.de/fhir/sid/hki-department').value.first()

resources/cql/DHKI_STRAT_MEDICATION_STRATIFIER

@@ -0,0 +1,5 @@
+define MedicationStatement:
+if InInitialPopulation then [MedicationStatement] else {} as List <MedicationStatement>
+
+define function AppliedMedications(medication FHIR.MedicationStatement):
+medication.medication.coding.code.last()

resources/cql/DHKI_STRAT_SPECIMEN_STRATIFIER

@@ -0,0 +1,8 @@
+define Specimen:
+if InInitialPopulation then [Specimen] else {} as List<Specimen>
+
+define function SampleType(specimen FHIR.Specimen):
+specimen.type.coding.where(system = 'https://fhir.bbmri.de/CodeSystem/SampleMaterialType').code.first()
+
+define function SampleSubtype(specimen FHIR.Specimen):
+specimen.type.text.first()

resources/cql/DKTK_STRAT_AGE_STRATIFIER

@@ -4,5 +4,12 @@ from [Condition] C
 where C.extension.where(url='http://hl7.org/fhir/StructureDefinition/condition-related').empty() and C.onset is not null
 sort by date from onset asc)
 
+define FirstDiagnosis:
+First(
+from [Condition] C
+sort by date from onset asc)
+
 define AgeClass:
-if (PrimaryDiagnosis.onset is null) then 'unknown' else ToString((AgeInYearsAt(FHIRHelpers.ToDateTime(PrimaryDiagnosis.onset)) div 10) * 10)
+if (PrimaryDiagnosis.onset is null)
+then ToString((AgeInYearsAt(FHIRHelpers.ToDateTime(FirstDiagnosis.onset)) div 10) * 10)
+else ToString((AgeInYearsAt(FHIRHelpers.ToDateTime(PrimaryDiagnosis.onset)) div 10) * 10)