Funding for this research was provided by:
Japan Society for the Promotion of Science (KAKENHI JP22370092, KAKENHI JP24370101, KAKENHI JP25650160, KAKENHI JP26291100)
Received: 26 January 2022
Accepted: 26 April 2022
First Online: 10 May 2022
: The JKB Study was approved by the ethics committees of Kindai University Faculty of Medicine and Kansai Medical University. The study was conducted in accordance with the ethical principles stated in the Declaration of Helsinki. All parents and guardians received printed information regarding the study, including the dose of radiation exposure from DXA, and signed a letter of consent. All students were informed that they could decline survey completion on their own accord at any time.
: Not applicable.
: The authors declare that they have no competing interests.