Author contributions
H.I. to and M.S. (Michito Shimozuru) conceived of the study. N.M., M.Y.,
M.N., Y.Y., T.T., M.S. (Michito Shimozuru) and S.N. were involved in
sample collection. J.Y., H.I., M.I.-M., and H.Q. supported with the
technical aspects of the experiment. S.N. performed all laboratory work
and constructed each age estimation model. S.N. and M.S. (Michito
Shimozuru) wrote the article with inputs from J.Y., T.T., M.S. (Mariko
Sashika), H.I. and M.I.-M. All authors reviewed the article.