Corrigendum to "A non-enzymatic electrochemical sensor for detection of sialic acid based on a porphine/graphene oxide modified electrode via indicator displacement assay" [Electrochim. Acta 269(2018) 136–143]. (1st February 2020) - Liu, Tailin; Fu, Bo; Chen, Jincheng; Yan, Zhihong; Li, Kang