Trajectories of perioperative serum carcinoembryonic antigen and colorectal cancer outcome: A retrospective, multicenter longitudinal cohort study oleh Zhenhui Li, Chunxia Li, Hongjiang Pu, Xiaolin Pang, Yingyi Wang, Dafu Zhang, Ming Lei, Xianshuo Cheng, Yanrong Zhao, Guiyu Lu, Yingying Ding, Le Cai, Zaiyi Liu, Tao Zhang, Dingyun You