Bone mineral density response to estrogen replacement in frail elderly women: a randomized controlled trial. - Villareal DT; Binder EF; Williams DB; Schechtman KB; Yarasheski KE; Kohrt WM; Villareal, D T; Binder, E F; Williams, D B; Schechtman, K B; Yarasheski, K E; Kohrt, W M (JAMA: Journal of the American Medical Association, 2001)