Author’s contributions
Yoshiaki Takahashi: wrote the manuscript.
Yoshiaki Kinoshita: revised the manuscript.
Takashi Kobayashi: revised the manuscript.
Yuhki Arai: managed the postoperative course.
Toshiyuki Ohyama: managed the postoperative course.
Naoki Yokota: managed the postoperative course.
Koichi Saito: managed the postoperative course.
Yu Sugai: managed the postoperative course.
Shoichi Takano: managed the postoperative course.