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Contributors TM and RD wrote the draft paper and compiled the figures. LM, BM, SR and JB revised the draft paper. JB was the operating surgeon for each case. TM is the guarantor of the paper.
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 by Graham Flint, Birmingham, UK.