Acknowledgements
National Digestive Diseases Information Clearinghouse - https://digestive.niddk.nih.gov/ddiseases/pubs/crohns/
NHS Health A-Z - https://www.nhs.uk/Conditions/Crohns-disease/Pages/Introduction.aspx
Wikipedia - https://en.wikipedia.org/wiki/Crohn%27s_disease
BBC - https://www.bbc.co.uk/health/
Guardian - https://www.guardian.co.uk/science/medical-research
Youtube - https://www.youtube.com/
FDA - https://www.fda.gov/downloads/ForConsumers/ConsumerUpdates/ucm107364.pdf
Rang, H.P. and Dale, M.M (2007) Pharmacology (Sixth Edition). Churchill Livingstone (Elsevier). P350, 395-6.