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Contributors HLC: Histopathologic examination and manuscript preparation; DD: Clinical diagnosis, histopathologic examination, photography, and manuscript preparation; HL: Clinical diagnosis; VS: Clinical diagnosis, genetic counselling, and manuscript preparation; NS: Genetic counselling; KB: Genetic counselling and DNA testing; BC: Treatment, clinical follow-up, and manuscript preparation; PA: Clinical diagnosis, DNA testing and manuscript preparation.
Competing interests None.
Patient consent Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.
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