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Contributors NCF and JF discussed and agreed on the technique described. They agreed on the content of the letter. JR assisted in the procedures and collated outcomes. All authors reviewed and edited the letter.
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.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; internally peer reviewed.