Corrigendum: Pulsed Electrical Stimulation of the Human Eye Enhances Retinal Vessel Reaction to Flickering Light - Freitag, Stefanie; Hunold, Alexander; Klemm, Matthias; Klee, Sascha; Link, Dietmar; Nagel, Edgar; Haueisen, Jens (Frontiers in Human Neuroscience, 2020)