Age-specific reference ranges for serum testosterone and androstenedione concentrations in women measured by liquid chromatography-tandem mass spectrometry - Haring, R; Hannemann, A; John, U; Radke, D; Nauck, M; Wallaschofski, H; Owen, L; Adaway, J; Keevil, B G; Brabant, G (J Clin Endocrinol Metab, 2012)