About the Authors

Kyoko Nishihara

nishihara-kk@igakuken.or.jp

Affiliations Fatigue and Working Life Research Group, The Institute for Science of Labour, Kanagawa-ken, Japan, Integrated Brain Function Project, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan

Noboru Ohki

Affiliation NoruPro Light Systems, Tokyo, Japan

Hideo Kamata

Affiliation Department of Obstetrics and Gynecology, Teikyo University, School of Medicine, Tokyo, Japan

Eiji Ryo

Affiliation Department of Obstetrics and Gynecology, Teikyo University, School of Medicine, Tokyo, Japan

Shigeko Horiuchi

Affiliation Department of Maternal Infant Nursing & Midwifery, St. Luke’s International University, Tokyo, Japan

Competing Interests

The authors have read the journal's policy and have the following competing interests: The authors declare that the Tokyo Metropolitan Institute of Medical Science has independently obtained Japanese, US, and European patents; Title: Fetal movement information processing device and information processing method, Number: JP4987003 (May 11, 2012), US8764686 B2 (July 1, 2014), EP (under registration, Feb 4, 2015) The first author is one of the inventors. This does not alter the authors’ adherence to PLOS ONE policies on sharing data and materials, as detailed on line in the guide for authors. Noboru Ohki is the president of NoruPro Light Systems, Inc. which does managing consulting services. This does not alter the authors’ adherence to all the PLOS ONE policies on sharing data and materials. The other authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: HK ER KN SH. Performed the experiments: HK ER KN SH. Analyzed the data: HK ER KN SH. Contributed reagents/materials/analysis tools: HK ER KN SH. Wrote the paper: KN. Wrote the software: NO.