Authors’ contributions
Kazuhiro Hiyama made substantial contributions to the data acquisition and the study conception, design, and interpretation. He was also involved in the initial drafting of the manuscript and critically revising the final manuscript.
The other authors were involved in revising the final manuscript. All of the authors have reviewed the final manuscript and gave their approval to the version to be published. In addition, they agree to be accountable for all aspects of the work, including for ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.