Erratum: Simultaneous Determination of Hydroquinone and Catechol by Differential Alternative Pulses Voltammetry. Issue 10 (9th October 2018) - Ayala, Alan; Stoytcheva, Margarita; Zlatev, Roumen; Velkova, Zdravka; Gochev, Velizar; Valdez, Benjamin; Montero, Gisela