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Piper, Thomas; Geyer, Hans; Nieschlag, Eberhard; Bally, Lia; Thevis, Mario (2021). Carbon isotope ratios of endogenous steroids found in human serum-method development, validation, and reference population-derived thresholds. Analytical and bioanalytical chemistry, 413(22), pp. 5655-5667. Springer 10.1007/s00216-021-03439-9
