AUTHOR CONTRIBUTIONS
Conception of the work: Mamoru Arakawa, Daijiro Hori. Analysis and
interpretation of data: Mamoru Arakawa, Yuichiro Kitada. Data
collection: Mamoru Arakawa, Yuichiro Kitada, Kei Akiyoshi. Drafting of
the manuscript: Yuichiro Kitada. Critical revision of the manuscript:
Homare Okamura, Naoyuki Kimura. Approval of article: Atsushi Yamaguchi.
Table 1. Preoperative patient characteristics per study group