<status value="draft"/><description value="Alteplase for Stroke"/><actual value="true"/><characteristic><description value="IV alteplase 0.9 mg/kg (maximum 90 mg) as 10% of dose over 1 minute and 90% over 1 hour"/><definitionCanonical value="http://example.org/fhir/ActivityDefinition/example-alteplase-dosing"/></characteristic></EvidenceVariable>

"Alteplase for Stroke" is an exposure concept with a detailed dosing instruction that may be used in expressing what an Evidence is about.