Estimated effect of breast self-examination and routine physician examinations on breast cancer mortality: GREENWALD, P., NASCA, P. C., LAWRENCE, C. E., HORTON, J., McGARRAH, R. P., GABRIELE, T. and HAINES, C. R. N.Y. State Dept. Health, Cancer Control Bur., Albany Med. Coll., Albany, N.Y., U.S.A. N. Engl. J. Med. 299(6), 271–273, 1978