Received: 23 May 2019
Accepted: 1 July 2019
First Online: 8 July 2019
Ethics approval and consent to participate
: The study was approved by the Research Ethics Committee of the University of Shizuoka (#25–30). Written informed consent was obtained from all participants.
: All authors approved the final version of the manuscript and submission to the Journal of Physiological Anthropology.
: The authors declare that they have no competing interests.