Axillary Staging of Early-Stage Invasive Breast Cancer by Ultrasound-Guided Fine-Needle Aspiration Cytology: Which Ultrasound Criteria for Classifying Abnormal Lymph Nodes Should Be Adopted in the Post-ACOSOG Z0011 Trial Era? - Zhu Y; Zhou W; Zhou JQ; Fei XC; Ye TJ; Huang O; Chen XS; Zhan WW (Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine, 2016)