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Contributors RM was involved in planning and prepared the first and final manuscript. VP was involved in planning, surgical execution and data collection. RD reviewed the manuscript. MJ was involved in planning and data collection. RM is the guarantor of the study.
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.