Corrigendum to "A feasibility study of high-dose hypofractionated carbon ion radiation therapy using four fractions for localized hepatocellular carcinoma measuring 3 cm or larger" [Radiother. Oncol. 132 (2019) 230–235]. (February 2020) - Shibuya, Kei; Ohno, Tatsuya; Katoh, Hiroyuki; Okamoto, Masahiko; Shiba, Shintaro; Koyama, Yoshinori; Kakizaki, Satoru; Shirabe, Ken; Nakano, Takashi