Survival nomogram and risk classification system for patients with adrenocortical carcinoma: a study based on the SEER database and external validation in China

Zhizhou Li, Maoyu Wang, Wei Gang, Yidie Ying, Ziwei Wang, Qing Chen, Xufeng Yu, Wei He, Shuxiong Zeng, Zhensheng Zhang, Chuanliang Xu, Huiqing Wang