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Contributors AJ and MD'S designed the study, collected and analysed the data, drafted and revised the manuscript, and approved the version to be published. SP and ER identified the patients, performed data collection, reviewed the manuscript and approved the version to be published. PR assisted with data analysis and interpretation, reviewed the manuscript, and approved and revised the version to be published.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.