WIDE LEIF, NAESSÉN TORD, and ERIKSSON KARIN. 2010. “Effects of 17β-Oestradiol and Norethisterone Acetate on Sulfonation and Sialylation of Gonadotrophins in Post-Menopausal Women”. Upsala Journal of Medical Sciences 115 (2):97–106. https://doi.org/10.3109/03009730903573253.