The effects of an antiprogestin, mifepristone, and an antiestrogen, tamoxifen, on endometrial 17 beta-hydroxysteroid dehydrogenase and progestin and estrogen receptors during the luteal phase of the menstrual cycle: an immunohistochemical study. - Mäentausta,O.; Svalander,P.; Gemzell Danielsson,K.; Bygdeman,M.; Vihko,R. (J Clin Endocrinol Metab, 1993)