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.