Corrigendum to “Functional cortical source connectivity of resting state electroencephalographic alpha rhythms shows similar abnormalities in patients with mild cognitive impairment due to Alzheimer's and Parkinson's diseases” [Clin. Neurophysiol. 129 (2018) 766–782] (Clinical Neurophysiology (2018) 129(4) (766–782), (S1388245718300245), (10.1016/j.clinph.2018.01.009))