About the Authors

Hiroyuki Sako

Affiliation Department of Surgery, School of Medicine, Keio University, Shinjuku-ku, Tokyo, Japan

Kazumasa Fukuda

Affiliation Department of Surgery, School of Medicine, Keio University, Shinjuku-ku, Tokyo, Japan

Yoshiro Saikawa

saiky@z8.keio.jp

Affiliation Department of Surgery, School of Medicine, Keio University, Shinjuku-ku, Tokyo, Japan

Rieko Nakamura

Affiliation Department of Surgery, School of Medicine, Keio University, Shinjuku-ku, Tokyo, Japan

Tsunehiro Takahashi

Affiliation Department of Surgery, School of Medicine, Keio University, Shinjuku-ku, Tokyo, Japan

Norihito Wada

Affiliation Department of Surgery, School of Medicine, Keio University, Shinjuku-ku, Tokyo, Japan

Hirohumi Kawakubo

Affiliation Department of Surgery, School of Medicine, Keio University, Shinjuku-ku, Tokyo, Japan

Hiroya Takeuchi

Affiliation Department of Surgery, School of Medicine, Keio University, Shinjuku-ku, Tokyo, Japan

Tai Ohmori

Affiliation Department of Surgery, School of Medicine, Keio University, Shinjuku-ku, Tokyo, Japan

Yuko Kitagawa

Affiliation Department of Surgery, School of Medicine, Keio University, Shinjuku-ku, Tokyo, Japan

Competing Interests

The authors have the following interests: This study was funded in part by Novartis Pharma. This does not alter the authors' adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: HS KF YS RN TT NW HK HT TO YK. Performed the experiments: HS KF. Analyzed the data: HS KF. Contributed reagents/materials/analysis tools: HS KF YS. Contributed to the writing of the manuscript: HS KF YS.