About the Authors

Hiroshi Kawaguchi

hiro-kawaguchi@nms.ac.jp

Affiliation Department of Anesthesiology, Nippon Medical School, Bunkyo-ku, Tokyo, Japan

Keiko Hirakawa

Affiliation NMR Laboratory and Department of Legal Medicine, Nippon Medical School, Bunkyo-ku, Tokyo, Japan

Kensuke Miyauchi

Affiliation Department of Anesthesiology, Nippon Medical School, Bunkyo-ku, Tokyo, Japan

Kaoru Koike

Affiliation Department of Primary Care and Emergency Medicine, Kyoto University Graduate School of Medicine, Kyoto, Japan

Youkichi Ohno

Affiliation NMR Laboratory and Department of Legal Medicine, Nippon Medical School, Bunkyo-ku, Tokyo, Japan

Atsuhiro Sakamoto

Affiliation Department of Anesthesiology, Nippon Medical School, Bunkyo-ku, Tokyo, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: HK AS. Performed the experiments: HK KH KM. Analyzed the data: HK KH KK YO. Contributed reagents/materials/analysis tools: HK. Wrote the paper: HK.