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