1Department of Medical Technology, Okayama University Graduate School of Health Sciences, Okayama, Japan
2College of Liberal Arts and Sciences, Tokyo Medical and Dental University, 2-8-30, Kohnodai, Ichikawa-shi, Chiba 272-0827, Japan
3Osaka Medical Center for Health Science and Promotion, Osaka, Japan
4Jichi Medical University, Saitama, Japan