TY - JOUR AU - Xu, H X; Lu, M D; Liu, G J TI - Imaging of peripheral cholangiocarcinoma with low-mechanical index contrast-enhanced sonography and SonoVue: initial experience JO - J Ultrasound Med VL - 25 PY - 2006 DO - 10.7863/jum.2006.25.1.23 SP - 23 EP - 33 N1 - b ER -