?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Blackwood&rft.aufirst=B&rft.au=Blackwood%2C+B&rft.issue=11&rft.atitle=Sedation+AND+Weaning+In+Children+(SANDWICH)%3A+protocol+for+a+cluster+randomised+stepped+wedge+trial&rft.date=10+November+2019&rft.issn=2044-6055&rft.title=BMJ+Open&rft.volume=9&rft.genre=article