Received: 5 July 2021
Accepted: 10 November 2021
First Online: 2 January 2022
: Ethics approval was granted on 13 April 2015 by the National Research Ethics Service Committee South West, registration number 15/SW/0084. All methods were carried out in accordance with relevant guidelines and regulations (eg. Helsinki declaration). Informed consent was obtained from all participants.
: Not applicable.
: Kerenza Hood declares membership of the National Institute for Health Research (NIHR) Health Technology Assessment (HTA) General Committee (2016–present), the NIHR Research Professors Committee (2019–present), the NIHR Clinical Trials Unit Standing Advisory Committee (2014–18) and the NIHR HTA Funding Committee Policy Group (2017–present). Gerri Sefton declares grants from the NIHR Invention for Innovation (i4i) programme for the Dynamic Electronic Tracking and Escalation to reduce Critical care Transfers (DETECT) study outside the submitted work. Lyvonne Tume declares being a member and vice chairperson of the NIHR HTA Topic Identification Panel (Panel C) (2016–January 2020), a member of the NIHR HTA Prioritisation Committee C (2016–19) and a member of the HTA Prioritisation Committee C Methods Group (2016–19). Damian Roland declares being clinical lead for the NHS England/Royal College of Paediatrics and Child Health National Paediatric Early Warning System programme (2018–present).