Opfermann G, et al. Factors influencing the steroid profile in doping control analysis. J Mass Spectrom 2008;43:877-91. free download of the article Van Renterghem P, Van Eenoo P, Van Thuyne W, et al [...] spectrometry analysis of urinary steroids to detect misuse of testosterone in sport. Rapid Commun Mass Spectrom 1994;8:304-8. Recent Publications Piper T, Geyer H, Haenelt N, Huelsemann F, Schaenzer W, Thevis