Akira Suzuki [ Faculty of Education, Chiba University, Chiba 263-8522, Japan & Graduate School of Horticulture, Chiba University, Chiba 271-8510, Japan ]
Hoang Pham Nguyen Duc [ Graduate School of Horticulture, Chiba University, Chiba 271-8510, Japan ]
Kosuke Nakamura [ Division of Novel Foods and Immunochemistry, National Institute of Health Sciences ]
Hiroshi Akiyama [ Division of Novel Foods and Immunochemistry, National Institute of Health Sciences ]
Yoshimasa Kasahara [ The Yamagata Prefectural Institute of Public Health, Yamagata 990-0031, Japan ]