Funding for this research was provided by:
Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology of Japan (17K16434)
Received: 12 April 2019
Accepted: 30 December 2019
First Online: 6 January 2020
Ethics approval and consent to participate
: This study was conducted in accordance with the Declaration of Helsinki and Ethical Guidelines for Medical and Health Research Involving Human Subject in Japan. General written consent for the use of clinical data for research purposes was obtained from the patient before starting radiotherapy and submission of this paper.
: The patient provided written consent to the use of clinical data for publication.
: The authors declare that they have no competing interests.