Article Text
Letter
Famous blue stain coat (with sincere gratitude to Leonard Cohen)
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Footnotes
Contributors DQT, NM, PK, AS, PM, and PL participated in the planning and reporting.
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.