Hormone re placement therapy for secondary prevention of coronary heart disease [3] (multiple letters) by Pan, C, Boal, J, Banks, E, Beral, V, Ong, P, Sorensen, M, Hayward, C, Webb, C, Collins, P, Sullivan, J, Heckbert, SR, Weiss, N, Psaty, B, Vandenbroucke, J, Hulley, S, Grady, D, Vittinghoff, E, Bush, T, Furberg, C, Herrington, D, Riggs, B, Pettiti, D