ASO Author Reflections: ypTNM Stage Grouping in the 8th Edition of the AJCC Cancer Staging Manual Refines the Prognostic Prediction for Patients with Esophageal Squamous Cell Carcinoma Undergoing Neoadjuvant Chemotherapy. - Sudo N; Ichikawa H; Muneoka Y; Hanyu T; Kano Y; Ishikawa T; Hirose Y; Miura K; Shimada Y; Nagahashi M; Sakata J; Kobayashi T; et al. (Annals of surgical oncology, 2021)