Notes: Summary report of project: <<https://www.canada.ca/en/health-canada/services/publications/health-risks-safety/residential-radon-mitigation-actions-follow-up-study.html>> Reducing Radon Levels in Existing Homes: A Canadian Guide for Professional Contractors - <<https://www.canada.ca/en/health-canada/services/environmental-workplace-health/reports-publications/radiation/reducing-radon-levels-existing-homes-canadian-guide-professional-contractors-health-canada-2010.html>>  