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In: Proceedings of the 20th International Conference of Racing Analysts and Veterinarians, Mauritius 2014. Anal Bioanal Chem. Sport und Buch Strauß, Köln (2004) 65 68 Mareck, U., Sigmund, G., Opfermann, G., Geyer, H., Schänzer, W.: Screening on letrozoleand ist metabolite in doping analysis. Drug Test Anal. Mass Spectrom. The study was approved by the ethics committee of the Deutsche Sporthochschule Köln (German Sport University Cologne) and presented to the data protection officers for Rhineland-Palatinate and North Rhine–Westphalia and gained approval. Analysis, 2012, 4. Recent advances in doping analysis (26). Biol. Recent advances in doping analysis (16). Proceedings of the 10th Cologne Workshop on Dope Analysis 7th to 12th June 1992, Sport und Buch Strauß, Köln (1993) 141-152. Recent advances in doping analysis (13). Recent advances in doping analysis (18). 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