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Error in the calculation of person-time in the before-PrEP period by Beymer et al
  1. Sebastiaan H Hulstein,
  2. Elske Hoornenborg,
  3. Maarten F Schim van der Loeff
  1. Infectious Diseases, GGD Amsterdam, Amsterdam, The Netherlands
  1. Correspondence to Sebastiaan H Hulstein, Department of Infectious Diseases, GGD Amsterdam, Amsterdam, 1018 WT, The Netherlands; bhulstein{at}ggd.amsterdam.nl

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Studies on STI incidence and pre-exposure prophylaxis (PrEP) use are often hampered by the absence of STI incidence data in the period before PrEP; Beymer et al 1 set out to improve on this. They report on the STI incidence before and after initiation of PrEP in a cohort of men who have sex with men at the Los Angeles LGBT Center, California, USA. We fear …

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Footnotes

  • Contributors SHH drafted the letter. EH and MFSvdL provided feedback and edited the letter. All authors agree with the final version of the letter.

  • Funding None declared.

  • Competing interests None declared.

  • Ethics approval Not required.

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

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