TY - BOOK TI - Preoperative axillary lymph node staging by ultrasound-guided cytology using a four-level sonographic score PB - BMC Medical Imaging KW - Medical Technology KW - Medtech UR - http://bmcmedimaging.biomedcentral.com/articles?tab=keyword&searchType=journalSearch&sort=PubDate&volume=16&page=2 ER -