Show 10 5 10 15 20 50 100 250 Sort by year (new to old) Actions Download search results Subscribe to news feed Your filters: cql: author="Olthaar, André J." or (type any "bookEditor issueEditor" and editor="Olthaar, André J.") Add to list Journal Article A1 open access Description and validation of an equilibrium dialysis ID-LC-MS/MS candidate reference measurement procedure for free thyroxine in human serum Heleen I. Jansen, Rob van der Steen, André Brandt, André J. Olthaar, Hubert W. Vesper, Eri Shimizu, Annemieke C. Heijboer, Katleen Van Uytfanghe (UGent) and Antonius E. van Herwaarden (2023) CLINICAL CHEMISTRY AND LABORATORY MEDICINE. 61(9). p.1605-1611