Postmenopausal serum sex steroids and risk of hormone receptor-positive and -negative breast cancer: a nested case-control study - James, R E; Lukanova, A; Dossus, L; Becker, S; Rinaldi, S; Tjonneland, A; Olsen, A; Overvad, K; Mesrine, S; Engel, P; Clavel-Chapelon, F; Chang-Claude, J; Vrieling, A; Boeing, H; Schutze, M; Trichopoulou, A; Lagiou, P; Trichopoulos, D; Palli, D; Krogh, V; Panico, S; Tumino, R; Sacerdote, C; Rodriguez, L; Buckland, G; Sanchez, M J; Amiano, P; Ardanaz, E; Bueno-de-Mesquita, B; Ros, M M; van Gils, C H; Peeters, P H; Khaw, K T; Wareham, N; Key, T J; Allen, N E; Romieu, I; Siddiq, A; Cox, D; Riboli, E; Kaaks, R (Cancer Prev Res (Phila), 2011)