Allantoin in Human Plasma, Serum, and Nasal-Lining Fluids as a Biomarker of Oxidative Stress: Avoiding Artifacts and Establishing Real in vivo Concentrations

Jan Gruber, Soon Yew Tang, Andrew M. Jenner, Ian Mudway, Anders Blomberg, Annelie Behndig, Katherine Kasiman, Chung-Yung J. Lee, Raymond C. S. Seet, Wenxia Zhang, Christopher Chen, Frank J. Kelly, Barry Halliwell