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Coagulation of cerebrospinal fluid—the Nonne–Froin sign

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  • Contributors NM drafted the paper. RM and AH managed the patient and collected clinical data. RM, AH, LM, KB and HZ revised the paper for intellectual content.

  • Competing interests None.

  • Ethics approval University of Gothenburg ethical committee.

  • Provenance and peer review Not commissioned. Externally peer reviewed. This paper was reviewed by Brendan McLean, Truro, UK.

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