Name Info Provider Link
Emergency Medical Services free resource MedlinePlus Health Information https://medlineplus.gov/emergencymedicalservices.html
subscription/membership/fee required Taylor & Francis https://www.tandfonline.com/doi/full/10.1080/00140139.2015.1074290
Full text from free resource Linkoping University Electronic Press http://liu.diva-portal.org/smash/get/diva2:915948/FULLTEXT02.pdf