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Funding This study was funded by Health Services Research and Development grant nos. CRE 12-035 and CIN 13-413.
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement This viewpoint manuscript reports no findings of any data. A complete study protocol from the larger trial described in this manuscript (ISRCTN15412521) is published elsewhere (DOI: 10.1186/s13012-015-0335-9). Data from the study described in this protocol are available in a form compliant with the funder’s data-sharing policies, by written request to the corresponding author.