Extension: "eReferral Form URL"
URL: "http://help.caredove.com/developer-integrations/fhir-extension-ereferral-form-url"
Value: urlType
Description:
This extension provides the direct URL to a Caredove listing. This URL is used for view the Service Details and Information, and can also be used to book or refer to the specific service.
Resource & Resource Element Locations:
This extension is located under HealthcareService 
Example:
"resource": {
                "resourceType": "HealthcareService",
                "id": "16907",
                "extension": [
                    {
                        "url": "http://help.caredove.com/developer-integrations/fhir-extension-ereferral-form-url",
                        "valueUrl": "https://sandbox.caredove.com/service/eventspage/16907"
                    }
