Dr. Jeppe Romme Christensen\'s last name is Romme Christensen. The correct citation is: Romme Christensen J, Börnsen L, Ratzer R, Piehl F, Khademi M, et al. (2013) Systemic Inflammation in Progressive Multiple Sclerosis Involves Follicular T-Helper, Th17- and Activated B-Cells and Correlates with Progression. PLoS ONE 8(3): e57820. doi:10.1371/journal.pone.0057820

**Competing Interests:**No competing interests declared.
