CS: Access Route
http://fhir.patientsknowbest.com/codesystem/access-route
https://www.hl7.org/fhir/STU3/codesystem.html
description
PKB tracks the source of each data point in the system, and this includes the access route by which the data was sent (e.g. HL7 API, web app, etc.)
Access route options are represented by codes in this system.