Correction to: International Journal of Clinical Oncology (2021) 26:1229–1236 https://doi.org/10.1007/s10147-021-01920-0

In the original publication, the name of fourth and seventh authors were incorrectly published as: Takashi Sangai and Hidetoshi Kawagichi. The correct version of names are: Takafumi Sangai and Hidetoshi Kawaguchi as given in this Correction.

The original publication has been corrected.