Percutaneous contrast-enhanced ultrasound for localization and qualitative diagnosis of sentinel lymph nodes in cutaneous malignant melanoma of lower extremities: a preliminary study - Guo, Rui-Qian; Xiang, Xi; Wang, Li-Yun; Zhu, Bi-Hui; Huang, Song-Ya; Tang, Xin-Yi; Chen, Jun-Jie; Qiu, Li (Quantitative Imaging in Medicine and Surgery, 2021)