On-chip contactless four-electrode conductivity detection for capillary electrophoresis devices - Baltussen, Erik.; Bastemeijer, Jeroen.; Berthold, Axel.; Bossche, Andre.; Dedem, Gijs W. K. van.; Guijt, Rosanne M.; Laugere, Frederic.; Sarro, Pascalina.; Steen, Gert van der.; Vellekoop, Michiel.