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Small spiral, big mass

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Footnotes

  • Contributors NV: study concept and design, acquisition and interpretation of data, drafting and revision of manuscript. AJL: interpretation of data, drafting and revision of manuscript. HRM: interpretation of data, drafting and revision 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.

  • Patient consent Not required.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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