0 Grady, D. Vittinghoff, E. Lin, F. Hanes, V. Ensrud, K. Habel, L. A. Wallace, R. Macer, J. Cummings, S. R. Shepherd, J. 2007 Effect of ultra-low-dose transdermal estradiol on breast density in postmenopausal women Menopause 14 391-6 17224859 http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=17224859