Predicting Axillary Lymph Node Metastasis in Patients With Breast Invasive Ductal Carcinoma With Negative Axillary Ultrasound Results Using Conventional Ultrasound and Contrast-Enhanced Ultrasound. - Zhu AQ; Li XL; An LW; Guo LH; Fu HJ; Sun LP; Xu HX (Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine, 2020)