Correction for: Lombardi V, Querin G, Ziff OJ, Zampedri L, Martinelli I, Heller C, Foiani M, Bertolin C, Lu CH, Malik B, Allen K, Rinaldi C, Zetterberg H, Heslegrave A, Greensmith L, Hanna M, Soraru G, Malaspina A, Fratta P. Muscle and not neuronal biomarkers correlate with severity in spinal and...