Ethics approval and consent to participate
WEST
The trial was approved by the Health Research Authority and NHS Research Ethics Committee (North West Liverpool East REC reference 18/NW/0100) on 13 April 2018. Informed consent was obtained from a parent/carer (or from the child if over the age of 16 and Gillick competent). Age-appropriate information sheets were provided, and children deemed to have capacity were asked to sign an age-appropriate assent form, in addition to their parent/carer’s consent.