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Contributors AE conceived the report and was involved in diagnosis and management of the case and in writing the manuscript. AK was involved in diagnosis and in writing the manuscript.
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 reviewed by Alasdair Coles, Cambridge, UK.