Following publication of the original article [1], the authors notified us that a comment in the Peripheral and neural biomarkers and genotype section was incorrectly phrased during editing. "4 weeks of treatment (four active ABCR sessions twice a week or control group sessions twice a week)" should have actually been described as "4 weeks of treatment (4 active, twice a week, ABCR sessions or 2 weekly control group sessions)".