https://www.nhs.uk/Conditions/Crohns-disease/Pages/Introduction.aspx?url=Pages/what-is-it.aspx
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https://en.wikipedia.org/wiki/Crohns_disease
https://news.patient.co.uk/newspaper.asp?ss=10&pc=4581
https://www.gicare.com/pated/ecdgs16.htm
