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Contributors All four authors SLB, CLF, JS and EE have contributed to the case description. EE and JS have conducted the clinical investigations and treatments of the two patients. All authors have approved the final 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 peer reviewed.