Correction

Correction for: Lam MA, Maghzal GJ, Khademi M, Piehl F, Ratzer R, Romme Christensen J, Sellebjerg FT, Olsson T, Stocker R. Absence of systemic oxidative stress and increased CSF prostaglandin F2α in progressive MS. Neurol Neuroimmunol Neuroinflamm. 2016 Jun 30;3(4):e256. doi: 10.1212/NXI.0000000000000256.  PMID: 27386506