Updates are available Correction dated 2019-10-24

Article History

Received: 9 July 2018

Accepted: 29 August 2018

First Online: 10 October 2018

Change Date: 24 October 2019

Change Type: Correction

Change Details: Following publication of the original article [1], we have been notified of a few mistakes:

Ethics approval and consent to participate

: Ethics approval for the Delphi study which is part of the DELTA² project was sought and received from the University of Oxford’s Medical Sciences Inter-Divisional Research Ethics Committee (IDREC - R46815/RE001). Informed consent was obtained for all participants in the Delphi study.

: All authors have completed the Unified Competing Interest form at ExternalRef removed (available on request from the corresponding author). JAB is employee of J&J and holds shares in this company. LVH is an employee of Novartis. The authors declare grant funding from the MRC UK and NIHR for this work. All of the other authors have been involved in design and conducting randomised trials through their roles. Most of the authors have also served on a committee which evaluates trial proposals for a funder (including for the MRC and NIHR UK). The authors declare that they have no other financial relationships that might have an interest in the submitted work, and all authors declare they have no other non-financial interests that may be relevant to the submitted work.

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