Add population count group-by items end point.

paths/population_statistics_groupByItems.yaml

@@ -0,0 +1,27 @@
+get: 
+  tags:
+    - Population statistics
+  operationId: groupByItems
+  summary: Group-by items for population count
+  responses:
+    200:
+      description: |-
+        Returns a list of all available group-by items for the population count end point, but only if the items are available for the selected customer. A customer is selected by a JWT-claim or the AGB header. The output of this end point should be the same as the documentation for the groupByItems-parameter of the population count end point. 
+      content: 
+        application/json:
+          schema:
+            type: array
+            items: 
+              type: string
+            example:
+              - age
+              - preferredDoctor
+              - insurer
+              - gender
+              - deprivedNeighborhood
+    400:
+      $ref: '../zoo-api.yaml#/components/responses/ReqFailure'
+    401:
+      $ref: '../zoo-api.yaml#/components/responses/JwtFailure'
+    404:
+      $ref: '../zoo-api.yaml#/components/responses/PatNotFound'

zoo-api.yaml

@@ -53,6 +53,8 @@ paths:
     $ref: 'paths/patient_fundusByPractice.yaml'
   /population/statistics:
     $ref: 'paths/population_statistics.yaml'
+  /population/statistics/groupByItems:
+    $ref: 'paths/population_statistics_groupByItems.yaml'
   /population/statistics/deprivedNeighborhood:
     $ref: 'paths/population_statistics_deprived.yaml'
   /population/statistics/employeeFeat: