Plasma sex hormone concentrations and breast cancer risk in an ethnically diverse population of postmenopausal women: the Multiethnic Cohort Study - Woolcott, C G; Shvetsov, Y B; Stanczyk, F Z; Wilkens, L R; White, K K; Caberto, C; Henderson, B E; Le Marchand, L; Kolonel, L N; Goodman, M T (Endocr Relat Cancer, 2010)