1. National Highway Traffic Safety Administration. National EMS Scope of Practice Model. Natl EMS Scope Pract Model [Internet]. [cited 2020 Mar 13]. Available from: http://www.ems.gov/education/EMSScope.pdf.
2. Models of International Emergency Medical Service (EMS) Systems
3. National EMS Information System. V2 Public EMS Strong Dashboard - NEMSIS [Internet]. [cited 2020 Mar 13]. Available from: https://nemsis.org/view-reports/public-reports/version-2-public-dashboards/v2-ems-strong-dashboard/.
4. Centers for Disease Control and Prevention. Products - Data Briefs - Homepage [Internet]. [cited 2020 Mar 30]. Available from: https://www.cdc.gov/nchs/products/databriefs.htm.
5. Ultrasound Guidelines: Emergency, Point-of-Care and Clinical Ultrasound Guidelines in Medicine