?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Christopher&rft.au=Evans%2C+Christopher&rft.aulast=Evans&rft.issn=2044-6055&rft.issue=2&rft.date=26+February+2025&rft.volume=15&rft.title=BMJ+Open&rft.atitle=Little+Journey%3A+a+phase+III+randomised+controlled+trial+of+a+psychological+preparation+and+education+smartphone+application+for+management+of+paediatric+perioperative+anxiety+compared+with+standard+care+in+children+undergoing+ambulatory+surgery+-+study+protocol&rft.genre=article