Competing interests: We declared the following interests based on NICE’s policy on conflicts of interests (https://www.nice.org.uk/Media/Default/About/Who-we-are/Policies-and-procedures/declaration-of-interests-policy.pdf): SJM is an employee of NICE, which is funded to develop clinical guidelines. NH has received speaker fees from Sanofi/Regeneron. The guideline authors’ full statements can be viewed at https://www.nice.org.uk/guidance/cg57/update/cg57-update-1/documents/register-of-interests-2. The guideline referred to in this article was produced by Guideline Development Team B at NICE. The views expressed in this article are those of the authors and not necessarily those of NICE.