Corrigendum to “Subacute combined degeneration of the spinal cord following nitrous oxide anesthesia: A systematic review of cases” [Clin. Neurol. Neurosurg. 173 (2018) 163–168]

The authors regret an erroneous translation of a non-English article (Jongen et al., 2001), in which 2 of 4 cases of subacute combined degeneration presented were incorrectly associated with nitrous oxide exposure. 2) In Section 3.4.1: a“39 cases…included 22 male patients and 17 female patients, with a mean age (SD) of 51.3 years (17.6).” should be replaced with “37 cases…included 21 male patients and 16 female patients, with a mean age (SD) of 50.4 years (17.6).” b“31 reports, while there was no evidence of pre-operative deficiency in 7 reports” should be replaced with “30 reports, while there was no evidence of pre-operative deficiency in 6 reports.” c“31 reports in which an etiology was identified, 26 were due to vitamin” should be replaced with “30 reports in which an etiology was identified, 25 were due to vitamin” d“age (p = 0.41), sex (p = 0.48), positive MRI findings (p = 0.42), post-operative serum B12 (p = 0.96), post-operative hemoglobin (p = 0.17) or type of surgery (p = 0.58). There was a tendency of post-operative high mean corpuscular volume (p = 0.14)” should be replaced with “age (p = 0.60), sex (p = 0.46), positive MRI findings (p = 0.47), post-operative serum B12 (p = 1.00), post-operative hemoglobin (p = 0.18) or type of surgery (p = 0.58).