Ultrasound image-based deep learning to assist in diagnosing gross extrathyroidal extension thyroid cancer: a retrospective multicenter studyResearch in context oleh Qi Qi, Xingzhi Huang, Yan Zhang, Shuangting Cai, Zhaoyou Liu, Taorong Qiu, Zihan Cui, Aiyun Zhou, Xinchun Yuan, Wan Zhu, Xiang Min, Yue Wu, Weijia Wang, Chunquan Zhang, Pan Xu