Author contributions K.Y., K.H., and H.H. were responsible for the study design and concept. K.Y., Y.T., and D.N. collected all data. K.Y., H.H., and T.G. performed the data analysis (statistical analysis). K.Y., K.H, Y.O., and M.T., did the interpretation of data. K.Y. and H.H. performed the manuscript preparation. K.Y., H.H., Y.T., and K.S. performed the manuscript edition and approved the final version of the manuscript for submission. Founding sourceThis research is funded by the Japanese Orthopedic Association as a research project foundation. Researchers had used them to buy dosimeters, and these funds had not affected any results and decision to submit this article. The corresponding author confirmed that he had full access to all the data in the study and had final responsibility for the decision to submit for publication.

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