Nomogram for prediction of fatal outcome in patients with severe COVID-19: a multicenter study oleh Yun Yang, Xiao-Fei Zhu, Jian Huang, Cui Chen, Yang Zheng, Wei He, Ling-Hao Zhao, Qian Gao, Xuan-Xuan Huang, Li-Juan Fu, Yu Zhang, Yan-Qin Chang, Huo-Jun Zhang, Zhi-Jie Lu