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Lumbar drains can affect CSF biomarker levels

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  • Contributors All authors have made substantial contributions to all of the following: (1) the conception and design of the study, or acquisition of data, or analysis and interpretation of data; (2) drafting the article or revising it critically for important intellectual content, and (3) final approval of the version to be submitted.

  • Competing interests LDW has received honoraria from and served on advisory boards for Medtronic, Bbraun and Codman. Other authors have no competing interests to declare.

  • Patient consent Not required.

  • Ethics approval All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Ethic committee approval was not required for this type of study.

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

  • Presented at Portions of this work were presented in abstract form at the Hydrocephalus 2017 International Society for Hydrocephalus and Cerebrospinal Fluid Disorders Conference, Kobe, Japan, September 2017.