1. National Institute for Health and Care Excellence. NICE Clinical Knowledge Summaries: Multiple sclerosis. 2019. Available at https://cks.nice.org.uk/topics/multiple-sclerosis/#!backgroundSub (accessed August 2020).
2. Multiple Sclerosis Trust. Nerve cells (neurons). 2018. Available at https://www.mstrust.org.uk/a-z/nerve-cells-neurons (accessed August 2020).
3. MS Society. MS in the UK. 2020. Available at https://www.mssociety.org.uk/what-we-do/our-work/our-evidence/ms-in-the-uk (accessed August 2020).
4. Public Health England. Multiple sclerosis: prevalence, incidence and smoking status - data briefing. 2020. Available at https://www.gov.uk/government/publications/multiple-sclerosis-prevalence-incidence-and-smoking-status/multiple-sclerosis-prevalence-incidence-and-smoking-status-data-briefing (accessed August 2020).
5. NHS. Overview: multiple sclerosis. 2018. Available at https://www.nhs.uk/conditions/multiple-sclerosis/ (accessed August 2020).