About the Authors

Manami Kikuchi

Affiliation Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki, Japan

Masako Shimada

shimada_masako@isc.sagami-wu.ac.jp

Affiliations Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki, Japan, Graduate School of Nutritional Science, Sagami Women’s University, Kanagawa, Japan

Takashi Matsuzaka

Affiliation Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki, Japan

Kiyoaki Ishii

Affiliation Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki, Japan

Yoshimi Nakagawa

Affiliations Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki, Japan, International Institute for Integrative Sleep Medicine, University of Tsukuba, Ibaraki, Japan

Misa Takayanagi

Affiliation Graduate School of Nutritional Science, Sagami Women’s University, Kanagawa, Japan

Nobuhiro Yamada

Affiliation Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki, Japan

Hitoshi Shimano

Affiliations Department of Internal Medicine (Endocrinology and Metabolism), Faculty of Medicine, University of Tsukuba, Ibaraki, Japan, International Institute for Integrative Sleep Medicine, University of Tsukuba, Ibaraki, Japan, AMED-CREST, Japan Agency for Medical Research and Development, Tokyo, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MK MS TM HS. Performed the experiments: MK MS KI MT. Analyzed the data: MK MS TM KI MT YN HS. Contributed reagents/materials/analysis tools: MK MS TM YN NY HS. Wrote the paper: MK MS HS.