1 Imperial College NHS Trust, The Bays, S Wharf Rd, Paddington, London W2 1NY, United Kingdom of Great Britain and Northern Ireland. Electronic address: Sarah.morton@doctors.org.uk.
2 Croydon University Hospital, 530 London Road, Croydon CR7 7YE, United Kingdom of Great Britain and Northern Ireland. Electronic address: Pascale.avery@nhs.net.