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RK and AK are joint first authors.
Contributors RK and SS: worked up the case, took the photographs and wrote the manuscript. AK and VG: involved in clinical management and final review of 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; internally peer reviewed.
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