Funding for this research was provided by:
Ministry of Education, Culture, Sports, Science and Technology (18K17938)
Japan Society of Nutrition and Food Science
the Comprehensive Research Project, Research Institute of Domestic science, Tokyo Kasei University
Received: 16 October 2020
Accepted: 11 February 2021
First Online: 19 February 2021
Ethics approval and consent to participate
: All participants signed an informed consent form. They provided samples by bone mass measurements and saliva collection, in addition to answeing questionnaires. The study was approved by the ethics committee of Tokyo Kasei University (Approval No. ITAH26-04).
: Not applicable.
: The authors declare that they have no competing interests.