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Contributors AG, AB and DP had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: AG and AB. Acquisition, analysis and interpretation of data: AG, AB, DA and DP. Drafting of the manuscript: AG and AB. Critical revision of the manuscript for important intellectual content: DP and DA.
Competing interests None declared.
Patient consent Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.
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