Corrigendum: “High-Resolution Spectral Domain-Optical Coherence Tomography in Multiple Sclerosis, Part II – The Total Macular Volume. The First Follow-Up Study Over 2 Years” - Serbecic, Nermin; Aboulenein-Djamshidian, Fahmy; Beutelspacher, Sven C.; Khan, Adnan; Vass, Clemens; Kristoferitsch, Wolfgang; Reitner, Andreas; Schmidt-Erfurth, Ursula (Frontiers in Neurology, 2015)