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A study on an adult population showed a prevalence of 2%, 1%, and 0.7% in the United States, the United Kingdom, and Canada, respectively.7 Likewise, an Argentinian study reported a prevalence of 1% in adolescents.8 The prevalence of CVS is unknown in the Mexican population but a study conducted on Mexican school-age children evaluated the prevalence of gut-brain axis disorders, and found a 0.3% prevalence of CVS in that selected group.9 CVS is more frequent in women and the mean adult age at presentation is 37 years

Maiuolo J, et al

10.1038/nrneurol.2012.168 95 LeeH.KimD

In the present study, we administered either NAC or ALC intrathecally for 4 weeks using osmotic minipumps and found marked neuroprotective effect on lesioned spinal motoneurons with almost complete restoration of density of dendritic branches and axonal terminals in the ventral horn

They are categorized as essential and non-essential, where the essential amino acids are the type that cannot be synthesized within the human body and thus need to be supplied to the body from exogenous sources to keep up the process of protein biosynthesis [2]