Thyroid Parenchyma Microcalcifications on Ultrasound for Predicting Lymph Node Metastasis in Papillary Thyroid Carcinoma: A Prospective Multicenter Study in China oleh Juan Liu, XiaoHong Jia, Ying Gu, Xia Chen, Ling Guan, JiPing Yan, Hong Zhai, Na Zhou, YiJie Dong, WeiWei Zhan, XiaoMao Luo, JianQiao Zhou