About the Authors

Tetsuya Kawahara

k-tetsuy@med.uoeh-u.ac.jp

Affiliation Kokura Medical Association Health Testing Center, Kitakyushu, Fukuoka, Japan

Ryuichiro Imawatari

Affiliations Kokura Medical Association Health Testing Center, Kitakyushu, Fukuoka, Japan, Kitakyushu Medical Association Committee on Health Promotion, Kitakyushu, Fukuoka, Japan, Kokura Medical Association, Kitakyushu, Fukuoka, Japan

Chie Kawahara

Affiliation First Department of Internal Medicine, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Fukuoka, Japan

Tetsuya Inazu

Affiliation Department of Pharmacy, Ritsumeikan University, Kusatsu, Shiga, Japan

Gen Suzuki

Affiliation Department of Internal Medicine, International University of Health and Welfare Clinic, Otawara, Tochigi, Japan

Competing Interests

RI is an employee of Kokura Medical Association of Health Testing Center, a unit of Kokura Medical Association and a member of Kitakyushu Medical Association Committee on Health Promotion, a unit of Kitakyushu Medical Association. Since Kokura ward is a subdivision of Kitakyushu city, Kokura Medical Association has affiliation with Kitakyushu Medical Association. This does not alter the authors' adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: TK. Performed the experiments: TK RI CK. Analyzed the data: TK GS. Contributed reagents/materials/analysis tools: TK CK GS. Wrote the paper: TK RI CK TI GS.