Received: 17 December 2019
Accepted: 29 April 2020
First Online: 8 May 2020
Ethics approval and consent to participate
: The study was approved by the Regional Committee for Medical and Health Research Ethics South East and by the Data Protection Authorities (2013/1829). Written informed consent was obtained from all patients; if the patient was cognitively impaired, relatives also gave their written assent. Patients unable to give consent were excluded from lumbar puncture in line with recommendations from REK.
: Not applicable.
: Hege Ihle-Hansen is a member of the editorial board in BMC neurology.