1. From the Departments of Ultrasound (L.X., J.Z., H.Z., G.W., W.Z., X.P., L.L.) and Head and Neck Surgery (A.Y.), Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou 510060, PR China; and Department of Ultrasound, Sun Yat-sen University, Affiliated Hospital 8, Shenzhen, PR China (W.T., Y.L.).