Mondal et al.38extended these findings in a crossover study with 33 PD patients with FOG, showing that 1 month daily self‐administered tcVNS (two 120 second GammaCore stimulation at intervals of 5–10 minutes) improved gait performance, reduced TNF‐α, and increased BDNF and glutathione, without major adverse events. This evidence concerns the gene BDNF and Parkinson disease.