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Piper, Thomas, Geyer, Hans, Nieschlag, Eberhard, Bally, Lia and Thevis, Mario (2021). Carbon isotope ratios of endogenous steroids found in human serum-method development, validation, and reference population-derived thresholds. Anal. Bioanal. Chem., 413 (22). S. 5655 - 5668. HEIDELBERG: SPRINGER HEIDELBERG. ISSN 1618-2650