@book{330657,
	title = {Preoperative axillary lymph node staging by ultrasound-guided cytology using a four-level sonographic score},
	publisher = {BMC Medical Imaging},
	url = {http://bmcmedimaging.biomedcentral.com/articles?tab=keyword&searchType=journalSearch&sort=PubDate&volume=16&page=2}
}