title: Redox titration challenge.
authors.affiliation: Measurement Science and Standards, National Research Council Canada, Ottawa, ON, Canada.
authors.forename: Juris
authors.initials: J
authors.lastname: Meija
authors.affiliation: Department of Oncology, The University Hospital in Kraków, Kraków, Poland.
authors.forename: Anna Maria
authors.initials: AM
authors.lastname: Michałowska-Kaczmarczyk
authors.affiliation: Faculty of Engineering and Chemical Technology, Technical University of Kraków, Kraków, Poland. michalot@o2.pl.
authors.forename: Tadeusz
authors.initials: T
authors.lastname: Michałowski