Preoperative prediction of central lymph node metastasis in clinically lymph node negative papillary thyroid microcarcinoma: a nomogram based on clinical and ultrasound features. - Minying Zhong; Deli Chen; Jieyi Ye; Yinting Chen; Chi Ma; Sixin Cheng; WeiJun Huang; Shijun Qiu (BMC Medical Imaging, 2025)