L. Hasikova, J. Zavada, T. Serranova, P. Kozlik, K. Kalikova, L. Kotackova, J. Trnka, D. Zogala, K. Sonka, E. Ruzicka, and P. Dusek. Serum but not cerebrospinal fluid levels of allantoin are increased in de novo Parkinson's disease. npj Parkinson's Disease, volume 9, issue 1, April 2023. L. Hasikova, J. Zavada, T. Serranova, L. Kotackova, P. Kozlik, K. Kalikova, J. Trnka, D. Zogala, K. Sonka, E. Ruzicka, and P. Dusek. The effect of tandem coupling of NicoShell and TeicoShell columns in sub/supercritical fluid chromatography on enantioresolution. Parkinsonism & Related Disorders, volume 90, 2021. P. Kozlik, L. Hasikova, B. Stiburkova, J. Zavada, and K. Kalikova. Rapid and reliable {HILIC}-{MS}/{MS} method for monitoring allantoin as a biomarker of oxidative stress. Analytical Biochemistry, Elsevier BV, volume 589, January 2020. L. Hasikova, M. Pavlikova, H. Hulejova, P. Kozlik, K. Kalikova, A. Mahajan, M. Herrmann, B. Stiburkova, and J. Zavada. Serum uric acid increases in patients with systemic autoimmune rheumatic diseases after 3~months of treatment with {TNF} inhibitors. Rheumatology International, Springer Science and Business Media LLC, volume 39, issue 10, pages 1749-1757, July 2019.