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  1. Aaron M Smith
  1. Correspondence to Aaron M Smith, Department of Otolaryngology-Head and Neck Surgery, University of Tennessee Health Science Center, 910 Madison Avenue Suite 430, Memphis, TN 38163, USA; asmit286{at}

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It feels like empty parentheses,

Magical punctuation that comes in pairs.

It's a place reserved for explanations,

For examples and etceteras. …

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  • Competing interests None.

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