4Thomas D B, Whitchead J, Dorse C. Mammographic calcifcations and risk of subsequent breat cancer[J]. Cancer Inst, 1993,85(3): 230.
5Kasumi F. Identification of microcalcifications in breast caricers by ultrasound [J]. Eighth international congress of the US examination of the breast abstracts imaging, 1993, 9(2):27.