A nomogram based on conventional and contrast-enhanced ultrasound for predicting high-volume central lymph node metastasis in papillary thyroid carcinoma. - Yan, Xing; Peng, Qinghai; Chen, Jia; Zhang, Rongsen; Tang, Kui; Xu, Yan; Wang, Zhigang; Niu, Chengcheng (BMC Cancer, 2025)