Conflicts of Interest The authors declare no conflicts of interest. Data Availability Statement Data sharing not applicable to this article as no datasets were generated or analyzed during the current study. References 1, , , , , and , “Assessment of Risk Factors Associated With Development of Oronasal Fistula as a Late Complication After Carbon-Ion Radiotherapy for Head and Neck Cancer,” Radiotherapy and Oncology 144 (2020): 53–58, https://doi.org/10.1016/j.radonc.2019.10.015.