title: Sensitivity and specificity of preoperative ultrasonography for diagnosing nodal metastases in patients with breast cancer.
authors.affiliation: Department of Gynecology and Obstetrics, Ernst-Moritz-Arndt University Greifswald, Greifswald, Germany.
authors.forename: K E
authors.initials: KE
authors.lastname: Koehler
authors.forename: R
authors.initials: R
authors.lastname: Ohlinger