1. Office of National Statistics. Leading causes of death, UK: 2001 to 2018 [Internet]. 2020 [cited 2020 Oct 17]. Available from: https://www.ons.gov.uk/peoplepopulationandcommunity/healthandsocialcare/causesofdeath/articles/leadingcausesofdeathuk/2001to2018
2. Clinical Audit and Research Unit. Cardiac Arrest Annual Report 2018/19 [Internet]. London Ambulance Service NHS Trust
3. 2019 [cited 2020 Oct 17]. Available from: https://www.londonambulance.nhs.uk/wp-content/uploads/2020/01/Cardiac-Arrest-Annual-Report-2018-2019.pdf
4. London Ambulance Service NHS Trust - Annual Report & Accounts 2018–19. Annu Rep.:128.
5. Redberg RF, Tucker KJ, Cohen TJ, Dutton JP, Callaham ML, Schiller NB. Physiology of blood flow during cardiopulmonary resuscitation. A transesophageal echocardiographic study. Circulation. 1993;88(2):534–42.