Author’s contributions
Study concept and design : Kenjiro Kunieda, Takashi Shigematsu, Hideaki Kanazawa, Ichiro Fujishima
Acquisition of data : Kenjiro Kunieda, Takafumi Sugi, Akiko Nomoto
Analysis and interpretation of data : Kenjiro Kunieda, Tomohisa Ohno, Akiko Nomoto, Ichiro Fujishima
Drafting of the manuscript : Kenjiro Kunieda, Takafumi Sugi, Tomohisa Ohno, Akiko Nomoto, Takashi Shigematsu, Hideaki Kanazawa, Ichiro Fujishima