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Contributors SG and RG conceived the study; JS and MGC operated on the baby and provided us with the data; DC and GBF edited the text; FG and LS supervised the final work.
Funding The manuscript has been read and approved by all the authors; the requirements for authorship have been met and each author believes that the manuscript represents honest work.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.