Author Contributions
Study conception: G Kuramoto, A Nakabayashi, J Kakogawa. Data collection: G Kuramoto, A Nakabayashi, J Kakogawa. Analysis: all authors. Investigation: all authors. Writing: J Kakogawa. Critical review and revision: A Nakabayashi, J Kakogawa. Supervision: N Masaoka. Final approval of the article: all authors. Accountability for all aspects of the work: all authors.