Breast cancer and hormonal contraceptives: Further results Collaborative group on hormonal factors in breast cancer

E. E. Calle, Jr Heath, H. L. Miracle-McMahill, R. J. Coates, J. M. Liff, S. Franceschi, R. Talamini, N. Chantarakul, S. Koetsawang, D. Rachawat, A. Morabia, L. Schuman, W. Stewart, M. Szklo, C. Bain, F. Schofield, V. Siskind, P. Band, A. J. Coldman