Yoji Takeuchi, Takeshi Yamashina, Noriko Matsuura, Takashi Ito, Mototsugu Fujii, Kengo Nagai, Fumi Matsui, Tomofumi Akasaka, Noboru Hanaoka, Koji Higashino, Hiroyasu Iishi, Ryu Ishihara, Noriya Uedo, Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka 537-8511, Japan
Henrik Thorlacius, Department of Clinical Sciences, Section of Surgery, Malmö, Lund University, SE-20502 Malmö, Sweden
Author contributions: Takeuchi Y planned and conducted the study; Takeuchi Y, Yamashina T, Matsuura N, Fujii M, Nagai K, Matsui F, Ito T, Hanaoka N and Uedo N collected the data; Takeuchi Y, Akasaka T, Higashino K, Ishihara R, Iishi H, Thorlacius H and Uedo N assisted with data analysis and interpretation; Takeuchi Y drafted the manuscript; all authors participated in the preparation of this report and approved the final version.
Institutional review board statement: The Local Ethics Committee of Osaka Medical Center for Cancer and Cardiovascular Diseases approved the protocols of this study.
Informed consent statement: Written informed consent was obtained from all patients upon inclusion.
Conflict-of-interest statement: All authors disclose that they have no financial relationships that are relevant to this publication.
Data sharing statement: The technical appendix, statistical code and data set are available from the corresponding author.
Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/
Correspondence to: Yoji Takeuchi, MD, Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases, 1-3-3 Nakamichi, Higashinari-ku, Osaka 537-8511, Japan. firstname.lastname@example.org
Telephone: +81-6-69721181 Fax: +81-6-69814067
Received: June 14, 2015
Peer-review started: June 15, 2015
First decision: July 10, 2015
Revised: August 24, 2015
Accepted: September 25, 2015
Article in press: September 28, 2015
Published online: November 25, 2015