Two weeks of transdermal estradiol treatment in postmenopausal elderly women and its effect on memory and mood: verbal memory changes are associated with the treatment induced estradiol levels - Wolf,O.T.; Kudielka,B.M.; Hellhammer,D.H.; Torber,S.; McEwen,B.S.; Kirschbaum,C. (Psychoneuroendocrinology, 1999)